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low fat diet
  • Health

Is Low Fat Healthy?

Katie WellsJan 13, 2023
Reading Time: 8 min

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Wellness Mama » Blog » Health » Is Low Fat Healthy?
Table of Contents[Hide][Show]
  • Low Fat Diets+−
    • List of Low-Fat Foods
    • My Take on the Above
  • Fear of Fat+−
    • What You’re Made of
  • Why We Need Fat
  • Saturated Fats: Friend or Foe?+−
    • Foods With Saturated Fat
  • Monounsaturated Fats 
  • Polyunsaturated Fatty Acids (PUFAs)+−
    • Omega-3: The Good Side of PUFAs
  • Trans Fats
  • What I Do
  • The Bottom Line on Low Fat Diets

Like most things in the nutrition world, fats are back in style. At least certain kinds, and in certain amounts. Some healthcare providers still recommend a low-fat diet, but is it really healthy? Here’s the scoop on fats, what they are, which ones are good (or bad), and what to do about them.

Low Fat Diets

It’s no secret that fats have had a bad reputation in recent decades. They’ve generally been discouraged by most in the medical community and nutritional fields. Ever since Ancel Keys presented his lipid heart hypothesis, doctors have sung the health benefits of reduced fat and fat-free diets.

In more recent years though we’ve seen a turnaround when it comes to dietary guidelines for fat. Scientists recognize some fat is necessary for health. While the medical community isn’t as quick to embrace things like butter and coconut oil, high-fat diets are currently more popular with the public.

If someone is experiencing gallbladder problems or certain health issues, it may be medically necessary to opt for lower-fat foods for a season. This is something to discuss with your healthcare practitioner or a functional nutritionist. Here’s a list of nonfat and low-fat options:

List of Low-Fat Foods

These foods are commonly recommended by mainstream dietitians and doctors. However, not all of them are healthy options. The more processed our food is, the less nutrition it has.

  • Lean meats like skinless poultry. Lean cuts like chicken breast are popular.
  • White fish, like cod, flounder, or pollock. Opt for wild-caught.
  • Whole grains, like brown rice, whole wheat, cereals, and whole-grain bread (see below)
  • Legumes, beans, and lentils (here’s my take on beans)
  • Dark leafy greens
  • Fresh or frozen fruit
  • Vegetables
  • Low-fat dairy (don’t recommend)
  • Egg whites

My Take on the Above

I typically avoid grains for several health reasons. And on the occasion I do have rice, it’s white rice instead of brown. You also won’t find me with whole wheat sandwich bread. These grains are harder to digest and have anti-nutrients, like phytic acid and arsenic. Ancient grains, like einkorn and fermented grains (sourdough), are better options.

Artificially reduced fat content, like low-fat cream, also doesn’t make my healthy eating list. Low-fat cottage cheese, fat-free cream cheese, skim milk, and low-fat yogurt are other commonly recommended options. Pasteurized, low-fat dairy products lack nutrition and can spike blood sugar. They’ve also been linked with higher rates of obesity.

If someone needs to reduce fat intake for a while, some options are healthier to focus on.

Fear of Fat

Many foods that are considered “healthy” by the majority of Americans carry a low-fat label. I once had a friend tell me she was going on the slim-fast and Special-K diet (cringe) because it was “low-fat.”

I could understand the fat phobia if perhaps fat had been linked to weight gain or disease incidence. Or maybe if America’s obesity epidemic had lessened since the low-fat craze. Or maybe if eating a low-fat diet actually caused long-term weight loss (anyone tried it?).

The sad fact is many people accept the idea fat is bad without understanding how we need it. Within the past decade fat intake from certain “good fats” has gone up, but what makes a good fat? And why do we need them?

What You’re Made of

Chemically, all fats are made up of varying numbers of hydrogen, oxygen, and carbon molecules. Each carbon atom is bonded to two other carbon atoms, and the more carbon atoms there are in a given fatty acid, the longer it will be. Fatty acids with longer chains typically have a higher melting point and yield more energy per molecule when metabolized.

Let’s break down the different types of fat and what they mean.

  • Saturated fats are saturated with hydrogen. They’re also solid or firm at room temperature. Examples include butter, coconut oil, and red meat.
  • Monounsaturated fats have fewer hydrogen atoms so they’re liquid at room temperature. Avocados and nuts are good examples.
  • Polyunsaturated fats tend to be liquid and they’re considered essential. Meaning our body can’t make them, we have to get them from food. Omega-3 and omega-6 fatty acids are the two main kinds. The issue is where we get them from and in what ratio.
  • Trans Fats naturally occur in small amounts in some animal foods. But the bad kind is artificially manipulated unsaturated fat. This one type of fat has been linked to disease.

Why We Need Fat

Now that we got biology out of the way, what does this mean in the dietary world?

We need essential fatty acids to help our bodies absorb fat-soluble vitamins. They’re also necessary for healthy skin, hair, and cell function. According to Harvard, they’re essential for blood clotting, muscles, building our cells, and fighting inflammation. Those are just a few of the reasons.

Fats provide 9 calories per gram and are broken down into fatty acids and glycerol (a source of energy) once in the body. When toxins enter the body and reach unsafe levels, the body attempts to equalize them by storing them in fat tissue. If we’re eating high levels of toxins (not fats) our body can store them, leading to disease.

So does fat make you fat?

While dietary fat is often blamed for weight gain, nothing happens in a vacuum. The body can break down fat into glucose and use it for energy. Although this process takes more energy than using the sugar already in our blood. Grains, processed carbs, and even sweet fruit become easy sources of energy.

Over time these easy energy sources can lead to insulin and leptin resistance. Insulin resistance can then lead to type 2 diabetes and metabolic disorders. Any extra carbohydrates we don’t use right away for energy end up stored as fat. Constantly feeding our body quick carbs means we don’t tap into our energy reserves (body fat). This is why too many carbs, sugar, and processed foods can make us gain unhealthy weight.

So if fats aren’t entirely to blame, what fats are we supposed to eat and what to avoid?

Saturated Fats: Friend or Foe?

The American Heart Association recommends getting a max of 6% of our calories from saturated fat. The idea is too much of this fat can raise cholesterol levels and lead to cardiovascular disease and high blood pressure. Dietitians and doctors once thought heart health relied on cutting out saturated fats.

But even the mainstream medical community is starting to admit the risk of heart disease is more nuanced than that. A 2010 meta-analysis of nearly 350,000 people showed there’s little to no evidence saturated fat increases the risk of heart disease. Harvard reports replacing saturated fats with carbs is more likely to have a negative effect on heart health.

They still hold that too much saturated fat can increase “bad” LDL cholesterol. Yet studies show this increase doesn’t lead to a higher death rate. 

Foods With Saturated Fat

Saturated fats are important for proper body functions. They also get most of the heat from the low-fat crowd. We need saturated fats in order to:

  • absorb certain vitamins
  • for calcium uptake
  • immune function
  • cell membrane structure

Contrary to what most experts say, a healthy, whole foods, traditional diet with saturated fat can actually help with weight loss. Many also notice better skin health, more energy, fewer cravings, and better sleep.

Here are foods that are good sources of saturated fat:

  • Red meat (Beef, pork, lamb)
  • Chicken (especially with skin)
  • Tallow and lard
  • Grass-fed dairy products (butter, cheese, ice cream)
  • Eggs
  • Coconut oil and coconut products
  • Palm oil (many people avoid it due to sustainability issues)
  • Olive oil (has a small amount of saturated fat)

Monounsaturated Fats 

Of all the fats, these are the most widely accepted. I like monounsaturated fats in moderation and include them in my meal plan. You can find them in varying amounts in certain oils, including:

  • olive oil
  • sunflower oil (high oleic is healthier)
  • sesame oil
  • flax oil
  • peanut oil and peanut butter (has both mono and polyunsaturated fats)
  • avocados
  • nuts and seeds

Some monounsaturated fats may not be the best option for cooking with though. There’s some concern high temps can create unhealthy free radicals. Research shows olive oil is safe to cook and bake with, but it’s not my first choice. I prefer to save my (pricier) olive oil for homemade salad dressings or drizzled over soups. When I was in a weight loss phase, I ate lots of olive oil!

Polyunsaturated Fatty Acids (PUFAs)

PUFAs are vegetable oils that are liquid even at cold temperatures. They can easily go rancid and break down into free radicals when heated. They’re also the most likely to be used for frying foods. You’ll also find them in butter substitutes, like margarine.

To add insult to injury, most of these oils are hydrogenated. This makes them last longer on the shelf. However, they’re unusable to the body since we can’t metabolize them. They can also create free-radical damage.

You’ll see polyunsaturated fats under names like corn, cottonseed, canola, vegetable, soybean, peanut, etc and most of them often carry the title “hydrogenated” or “partially hydrogenated.” My general advice to everyone is to completely avoid these types of fats, especially if they have been heated.

While I don’t ever recommend highly processed polyunsaturated fats, there are some positives.

Omega-3: The Good Side of PUFAs

PUFAs naturally occur in certain plant and animal foods. And these types of food also have anti-inflammatory omega-3 fatty acids. The issue is when they’re highly refined and out of balance. Most people eat way more omega-6 fats, but ideally, we’d have omega-3 and omega-6 in a 1:1 ratio. To combat this, many people now take omega-3 supplements.

I prefer to get my omega-3 fats from food as much as possible, and animal foods are the best source. Grass-fed and pasture-raised products are much higher in omega-3. While conventionally grain-fed raised animals have more omega-6 fats.

Here are some examples of healthy polyunsaturated fat (aka the omega-3 version)

  • Fatty fish (anchovies, sardines, salmon. etc.)
  • Grass-fed beef
  • Free range eggs

Flax and chia seeds have ALA omega-3 which is poorly converted by the body. I still use flax and chia for their health benefits, but they’re not the best source of omega-3s.

Omega-3s help with brain function, fight inflammation and boost energy levels. They also have the much-touted ALA, DHA, and EPA fats that are now added to many foods. I get my omega-3s from dietary sources, like anchovies and sardines.

Trans Fats

This fat completely deserves the heat it’s been getting. Hydrogenated trans fats aren’t healthy in any amount. This process turns unsaturated fats into much more dangerous trans fats. Our cells can’t absorb it which messes up their function.

Studies connect these guys to heart disease, obesity, abdominal fat, diabetes, and certain types of cancer. Trans fats are one of my arguments against the “everything in moderation” idea, as they aren’t safe in any amount.

As of 2020 the FDA no longer allows any amount of fat from added trans fats. Many countries around the world have also phased it out. In response, scientists turned to creating fully hydrogenated fats by replacing part of the fat molecule with stearic acid.

These “interesterified fats” are what allow snack makers to place that lovely “no-trans fat” label on their packaging. Don’t be fooled! Interesterified fats are just as dangerous. Some studies show they can slow down metabolism and negatively affect heart health.

They haven’t been thoroughly studied for safety and there are still unanswered questions. We don’t fully know yet how they affect fat and glucose metabolism, inflammation, or blood health. Most studies have been done in young, healthy males, which leaves out most of the population.

What I Do

When I first started eating real food, I was the biggest cheerleader for saturated fats. I’d typically drink 1/4 cup of coconut oil a day in coffee and tea. I also relied heavily on foods like free-range eggs and red meat. While saturated fat from healthy sources is still a good option for most people, not so much for me.

After getting my genetics tested I found out my body doesn’t process saturated fats (or eggs) very well. Personally, I’ve felt a lot better focusing more on fish, poultry, and olive oil for my fat sources. I share my personal insights on fats and oils in this short podcast episode here. Everyone is different though and what works for me won’t necessarily work for the next person.

The important thing is to get healthy fats from whole foods and as minimally processed as possible.

The Bottom Line on Low Fat Diets

I think we’ve established how important healthy fats are for body and brain function. We need fats, just the right ones.

As a recap:

  • Saturated fats from healthy meats, coconut, avocado, and nuts are good.
  • Monounsaturated fats are good as long as they’re not heated.
  • Omega-3s are vital to our body, especially because we eat them in improper ratios.

  • Processed vegetable oils, hydrogenated fats, trans fats, and interesterified fats are actually dangerous and should be avoided.

What kinds of fats do you eat? Do you avoid certain ones? Leave a comment and let me know!

Sources:
  1. American Heart Association. (2021, November 1). Saturated Fat.
  2. Harvard Health Publishing: Harvard Medical School. (2022, April 12). The truth about fats: the good, the bad, and the in-between.
  3. U.S. Food and Drug Administration. (2018, May 18). Trans Fat.
  4. van Rooijen, M. A., & Mensink, R. P. (2020). Palmitic Acid Versus Stearic Acid: Effects of Interesterification and Intakes on Cardiometabolic Risk Markers – A Systematic Review. Nutrients, 12(3), 615.
  5. Mensink, R. P., et al. (2016). The Increasing Use of Interesterified Lipids in the Food Supply and Their Effects on Health Parameters. Advances in nutrition (Bethesda, Md.), 7(4), 719–729.
  6. Siri-Tarino, P. W., et al. (2010). Meta-analysis of prospective cohort studies evaluating the association of saturated fat with cardiovascular disease. The American journal of clinical nutrition, 91(3), 535–546.
  7. Enig, M., & Fallon, S. (2000, January 1). The Skinny on Fats. Weston A. Price Foundation.
Category: Health

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About Katie Wells

Katie Wells, CTNC, MCHC, Founder of Wellness Mama and Wellnesse, has a background in research, journalism, and nutrition. As a wife and mom of six, she turned to research and took health into her own hands to find answers to her health problems. WellnessMama.com is the culmination of her thousands of hours of research and all posts are medically reviewed and verified by the Wellness Mama research team. Katie is also the author of the bestselling books The Wellness Mama Cookbook and The Wellness Mama 5-Step Lifestyle Detox.

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Reader Interactions

Discussion (75 Comments)

  1. Melissa

    November 9, 2011 at 2:13 PM

    I guess my question is more about the consumption of fat in general. I see so many people saying they’ve lost a lot of weight following a paleo or primal diet, and that means eating a significant amount of fat, right? Many sites seem as if following a paleo/primal diet means you can eat as much meat, good fats and veggies as you want and you’ll not only NOT gain weight, you’ll lose fat. So I guess I’m confused (if my question hasn’t already made that abundantly clear, LOL) – when eating paleo/primal, do calories still count in terms of weight loss or not? I would think they do, but up until recently I also thought whole grains were pretty darn healthy. ;o) Thanks for any guidance you can give, because I really feel completely lost on this issue.

    Reply
    • Niki

      November 18, 2011 at 12:19 AM

      You’d think watching calories in/calories out would equal weight loss, right?  Our bodies are actually more complicated than that–how much you eat is relevant, but what you eat is most important.  I follow the principle of eating healthy whole foods (paleo/primal) until I’m satisfied.  If you aren’t emotionally eating, you’ll find there’s only so much fat and protein you can consume so it’s not that easy to overeat.  I know there’s science behind it and also results.  I’ve lost over 40 lbs in three months literally without worrying how much I’m eating, while consuming significant amounts of fat.  Mmmmm tasty tasty fat!

      Reply
  2. Marci

    September 25, 2011 at 5:54 PM

    I might try coconut oil, I have never considered that. Thank you!

    Reply
    • Patty

      December 31, 2015 at 11:12 AM

      Coconut oil is good for so many things. Cooking, baking, deodorant, brushing your teeth/oil pulling, makeup removal, face moisturizer etc etc. Google it!

      Reply
  3. Marci

    September 25, 2011 at 12:27 PM

    Hello, I was wondering your opinion about extra virgin olive oil. I love eating scrambled eggs (from my own free range hens), and I always thought olive oil was healthier to cook them with. I have read mixed opinions about the effects of heating olive oil. Some say it doesn’t change the fat at all, others say it turns it all to trans fat, and even more people claim that as long as you do not exceed its heating point, it will be fine. Are there any good alternatives, or should I stick with olive oil? I also wanted to add that I do not use non-stick pans do to them releasing toxic chemicals.

    Thanks ahead of time, and I love your website by the way! : )

    Reply
    • Wellness Mama

      September 25, 2011 at 12:53 PM

      I’ve heard conflicting things also. We use coconut oil or butter,
      both are which are more stable at high temperatures, for cooking. We use olive oil in salads, cold recipes, etc.

      Reply
  4. Anna

    August 18, 2011 at 11:19 PM

    Great post! Just one thing: Aren’t the omega-3 and -6s polyunsaturated fatty acids? You’re saying they should be avoided. As those two types are still essential, how much should we consume of them?

    Reply
  5. Wellness Mama

    August 12, 2011 at 4:29 PM

    I’ve used Mercola’s and it seems good

    Reply
  6. Toni roberts

    August 5, 2011 at 3:54 AM

    At first, I get my omega 3 through eating fish, but I’ve recently discovered that eating fish may not be the best way to get omega 3 because of the metals that contaminate the fish. Right now, I take krill oil and I think it really helped me with my workout since it’s said to support the joints and maintain a healthy heart. 
    check out this video about krill oil and the other sources of omega 3: https://www.youtube.com/watch?v=lj-ZnG3NoZY
    As for cooking, i’ve read that coconut oil is the best choice out there right now.

    Reply
  7. lois

    June 12, 2011 at 10:04 PM

    Hello, I was wondering if there was a good way to explain to family and people who challenge grains, carbohydrates, and saturated fats because of misinformation. When they watch what I eat they probably think I am putting my family in danger and I want to explain it to them. I pretty much have to explain to them that the FDA standards for fat/carbs is incorrect based on the lipid hypothesis. But I don’t know how to tell them where the correct standards come from (in other words: fda standards from lipid hypothesis, True standards from…?)

    Reply
    • Wellness Mama

      June 14, 2011 at 2:55 AM

      For a shamless plug, I wrote an article that loosely covered this a while back https://wellnessmama.com/4285/real-food/. There is actually a lot of good science backing this healthier way of eating, and it is becoming more mainstream. the sad thing is, it used to be that “true standards come from common sense” but the last couple of decades have come in the way of logical thinking when it comes to nutrition. I’d refer them to doctors like Dr. Eades and have them watch Fat Head to help get the basics, and then send on some science from there if they want more.

      Reply
      • Sheial

        February 18, 2016 at 1:35 PM

        Love it! The NIH.gov website has a few short term studies with regards to Paleo eating and lifestyle, and all the results have been very positive. I think the Mayo clinic may also have some early research. These two sources are results focused and are pretty accessible by non-science types, so they can get the idea without being bogged down by the lingo.

        I know not every one wants to follow Paleo- I did for a while but found it too restrictive to be realistic for myself and family at this stage and have evolved to something more akin to Primal-, but it is a pretty prominent grain free lifestyle right now, so it is a good place to start learning.

        Reply
  8. Dotty

    May 17, 2011 at 1:02 AM

    Thanks for giving us the scoop on fats.  I’m enjoying using more animals fats lately and feeling better as a result.  I have some tallow from making beef broth and am not afraid to use it!  
    And I appreciate what you said about trans fats or hydrogenated oils…harmful in any amount.
    Coconut oil is our favorite for stir frying and raw butter is great on top.  

    Reply
  9. Katie Young

    March 9, 2011 at 10:39 PM

    What oil would you recommend if you just “have” to deep fry something?

    Reply
    • Wellness Mama

      March 9, 2011 at 10:55 PM

      Coconut Oil or rendered beef fat (tallow) is best for deep frying, and not actually horrible if you avoid all the grains in breading things.

      Reply
  10. Lisa Morgan

    March 8, 2011 at 11:04 AM

    Krill oil consumption could be very beneficial for an individual besides of being beneficial for the brain function, helps in strengthening the immune system, helps to improve mood of fight depression krill oil is also considered to be a powerful anti oxidant supplement because it contains a substance called Astaxanthin which is proven to be a good substance that can help fight or prevent those nasty aging signs this substance could also help in protecting the human skin from the harmful UV rays coming from the sun.

    Reply
    • Swalli

      June 2, 2011 at 3:32 AM

      What are the benefits of taking krill oil vs. skate liver oil vs. cod liver oil? I currently take fermented cod liver oil.  What source do you get your krill oil from?

      Reply
      • Wellness Mama

        June 2, 2011 at 3:33 AM

        Fermented Cod Liver oil is great, and has Vitamin D too… The good
        brands are pricey, so I’ve been using Krill oil, which is easier to
        find good sources of, but if you are taking FCLO… that’s awesome!

        Reply
        • Kelly

          May 17, 2015 at 5:14 PM

          Honestly, I don’t agree with most of this. I got lean following Freelee the banana girls raw till 4 way of eating. (Check her out on YouTube). Using cronometer to track nutrients you can go over what you need easily eating plant based lowfat vegan. I made the switch 5 years ago and am 104 lbs. at age 46! I eat about 1/2 of an avocado every 5-6 days.

          Reply
          • Jessica

            August 5, 2015 at 9:04 PM

            I can’t imagine any woman being at a healthy weight, let alone fit with muscle and strength at 104lbs unless well below normal height, just saying! By the way, I am 145lbs and lean, in the low 20s in percentage of body fat (athlete body fat level)…weight is only a part of the formula to health. Multiple studies indicate low fat diets are not healthy…your hormone are made from fat after all. Most vegans tend to be protein deficient and lack appreciable muscle mass, and are not very explosive due to the confinements of their dietary choices. Notice there are very few vegan athletes…

          • Mikaela

            February 16, 2016 at 12:00 AM

            Nice yeah I follow freelees lifestyle too makes more sense tbh and I feel great

          • breary

            May 5, 2016 at 1:36 AM

            Freelee doesn’t seem to care about actual health though, she is more obsessed with being skinny. She claims to care about health but when you watch her stuff you can see she mainly talks about being skinny/weight loss, thigh gaps etc. not actual health, and she honestly looks too skinny like her hips and elbows just look bony, But to each their own I suppose…

    • Lil

      August 12, 2011 at 2:43 AM

      Alright after typing this comment I’ll go get myself some krill! LOL! Seriously though, that’s quite a lot of benefits you mentioned there. Also read first about krill oil here: http://krilloil.mercola.com/krill-oil.html What brands would you guys recommend?

      Reply
    • stan

      August 14, 2011 at 4:39 AM

      One of the best things about krill oil is its resistance to rancidity. Many cheap fish oils, especially those that come in clear bottles, are actually rancid when you buy them. Krill is more stable, partly due to the astaxanthin content. You can put a drop of astaxanthin in your other oils to extend their shelf life as well.

      However, krill oil doesn’t have enough astaxanthin for you to get all the benefits this incredible antioxidant provides. You need at least 4-8 mg/day for that.

      Reply
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