Nuts – how healthy are they?

My friend sent me a link to this article from Paleo Diet Lifestyle website, great info, great pictures. And although I do not promote Paleo, as in my opinion is too heavy on animal protein, the article is very helpful as far deciding if you should include nuts into your diet. I know that there has been a debate on health benefits of nuts and when I was dealing with my health problems, I was off of all nuts and seeds for almost a year.

I do think in moderation in should be okay to have some nuts, and this article make the choice a bit easier.

Are Nuts And Seeds Healthy?

Are Nuts And Seeds Healthy?Nuts and seeds are a very popular snack among Paleo eaters and some people end up consuming quite a few of them. After all, they’re an easy and handy snack to bring to work or on hikes and most of them are loaded with nutrients. We know however that the fact that most nuts and seeds were available to our ancestors is not enough in itself to justify a frequent consumption. We need to look further into the composition of nuts and seeds, their levels of toxins and their nutritive value and assess things from there.

I already recommend cutting all nuts and seeds to people with digestive or autoimmune problems and people with gut flora imbalances, but what about healthy people?

You’ll see here that the answer is a mixed bag (of nuts) and that not all nuts or seeds are created equal. You’ll also see why I recommend keeping most nuts to a minimum and keep them as an occasional snack while keeping in mind that the nutritional value is often offset by undesired properties. There are also some steps that can be taken to reduce the toxic load of most nuts that should prove helpful to those who want to indulge.

In the conclusion, I’ll recommend the best nuts to consume and those to eat only very sporadically.

Phytic acid and other antinutrients

Grains and legumes are king when it comes to antinutrients, lectins, enzymes inhibitors and toxic proteins, but some nuts and seeds use similar defense mechanisms. Of course, unlike some very nasty plaint proteins (e.g. gluten), longterm damage and autoimmunity is unlikely to happen from eating nuts and seeds.

Lectins in some nuts and seeds can irritate the gut lining and create inflammation and enzyme inhibitors can prevent the full digestion of the proteins in them.

Phytic acid is a strategy employed to prevent the nut or seed from sprouting before the ideal conditions are present. Phytic acid on our digestive system has the property of binding to minerals like calcium, iron and magnesium and preventing them from being absorbed. This also means that you won’t necessarily get high amounts of a mineral even if you eat a nut high in that mineral.

Here are the amount of phytic acid found in some popular nuts for comparison purposes, data from

  • Cashews: 1,866 mg/100 grams;
  • Hazelnuts: 1,620 mg/100 grams;
  • Almonds: 1,280 mg/100 grams;
  • Walnuts: 760 mg/100 grams;
  • Chestnuts: 47 mg/100 grams;

Soaking nuts and seeds

Soaking your nuts and seeds overnight in salty water is an easy way to get rid of most of the phytic acid and other antinutrients. After the nuts have soaked for a number of hours, rinse them throughly and dry them under the sun, in a dehydrator or in an oven set at the absolute lowest temperature.

You don’t absolutely need to dry the soaked nuts and seeds, but the moisture on them will make it easy for mold to grow so they should be eaten quite quickly.

Polyunsaturated fat in nuts and seeds

The other problem when it comes to most nuts and seeds is the high amount of polyunsaturated fat (PUFA), especially the omega-6 polyunsaturated fat.

Along with access fructose and consumption of toxic grains and legumes, excess omega-6 and total PUFA intake strongly contribute to today’s chronic and metabolic diseases like diabetes, heart disease and obesity.

In the Paleo diet community, a huge focus is placed on balancing omega-6 and omega-3 intake to obtain a ratio as close to 1:1 as possible, but keeping the total intake of PUFA low is just as important, if not more. In high amount, any kind of PUFA, even omega-3s, become highly reactive and toxic.

In an effort to optimize health and longevity, one should strive to keep a total PUFA intake under 4% of total calories and an omega-6/omega-3 ratio very close to 1:1. On an average 2,200 calorie diet, 4% PUFA means only about 5 to 8 grams of omega-6 per day to maintain the proper ratio with omega-3 fats. This is very low and most nuts and seeds will quickly raise the amount to unhealthy levels. Omega-3 fats should be obtained from fatty wild fish, grass-fed ruminants and omega-3 rich eggs.

PUFAs are easily oxidized when in contact with oxygen, heat and light and oxidized PUFAs are a very bad deal for our health and creates all kinds of toxic reactions with sugars and proteins in our bodies. For this reason, nuts and seeds are much better eaten unroasted and should be refrigerated in an air-tight container and eaten promptly.

Nuts or seeds that contain appreciable levels of omega-3 fat are not necessarily a good source of omega-3 because the form of omega-3 found in plants, nuts and seeds is alpha-Linolenic acid (ALA), which isn’t useful for the body. When we talk about omega-3 fats being essential for the body, we’re talking about the long-chain EPAs and DHAs. ALA can be elongated to EPA and DHA, but the process is very inefficient.

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Lets now examine the most popular nuts and seeds one by one for their micronutrient value and their fat composition. The data is from the USDA food database:


Almonds are moderately high in PUFA, with a total of 12.1 grams per 100 grams, most of it in omega-6. They are a good source of manganese, copper, magnesium,  vitamin E and riboflavin. Wild almonds are highly toxic with a compound that breaks down to cyanide, but modern domesticated almonds don’t contain that compound.

PUFAs in almonds Almonds

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Macadamia nuts

Macadamia nuts are low in total PUFA compared to other nuts, with a total of only 1.5 grams per 100 grams and most of their fat being monounsaturated. The amount of total PUFA is low enough that the omega-6/omega-3 ratio is not a concern. They are a good source of thiamine, copper and manganese. Macadamia nuts are also very low in antinutrients like phytic acid. They are healthy even in higher amounts.

PUFAs in macadamia nuts Macadamia nuts

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Pistachios are moderately high in PUFA, with a total of 13.2 grams per 100 grams, most of it in omega-6 fat. They are a good source of copper, thiamine, manganese and vitamin B6.

PUFAs in pistachios Pistachios

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Walnuts are very high in PUFA, with a total of 47.2 grams per 100 grams, with a fair amount omega-3 fat. They are often praised for their high omega-3 content, but are way too high in total PUFA and still have a bad omega-6 to omega-3 ratio. They are a good source of magnesium. manganese and copper.

PUFAs in walnuts walnuts

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Pine nuts

Pine nuts are very high in PUFA, with a total of 34.1 grams per 100 grams, most of it in omega-6 fat. They are a good source of manganese, copper and magnesium.

PUFAs in pine nuts Pine nuts

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Chestnuts are very low in total PUFA, 0.9 grams per 100 grams, low enough that the omega-6/omega-3 ratio doesn’t matter. They are also low in antinutrients like phytic acid. Chestnuts are considered a real nut and are starchy instead of fatty and this is why they are low in PUFA. Unlike other nuts, they can be roasted at higher temperatures without problems. They are a good source of vitamin C, copper, manganese and vitamin B6. They are the only nut with an appreciable amount of vitamin C.

PUFAs in chestnuts Chestnuts

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Pecans are high in PUFA, with a total of 21.6 grams per 100 grams, most of it in omega-6 fat. They are a good source of manganese, copper and thiamine.

PUFAs in pecans Pecans

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Hazelnuts, also known as filberts, are moderately low in PUFA, with a total of 7.9 grams per 100 grams, most of it in omega-6 fat. They are a good source of vitamin E, thiamin, copper and manganese.

PUFAs in hazelnuts Hazelnuts

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Brazil nuts

Brazil nuts are high in PUFA, with a total of 20.6 grams per 100 grams, most of it in omega-6 fat. They are an extremely good source of selenium, with 774% of the recommended daily allowance (RDA) per 6 nuts. Selenium is an extremely important nutrient that’s lacking in many people’s diet. It’s a crucial antioxidant and is very important for the well functioning of the thyroid gland. Selenium is so important that it could be wise to eat a few brazil nuts regularly even though they are high in total PUFA. Keep in mind however that selenium becomes toxic in high amountsand that 2 or 3 brazil nuts per day should be more than enough. They are also a good source ofmagnesium and copper.

PUFAs in brazil nuts Brazil nuts

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Cashews are moderately low in PUFA, with a total of 7.8 grams per 100 grams, most of it in omega-6 fat. They are a good source of magnesium, phosphorus, copper and manganese.

PUFAs in cashews Cashews

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Pumpkin seeds

Pumpkin seeds are high in PUFA, with a total of 20.9 grams per 100 grams, most of it in omega-6 fat. They are a very good source of magnesium, a mineral that lacking in most people’s diet. They are also a good source of copper, manganese, iron and phosphorus.

PUFAs in pumpkin seeds Pumpkin seeds

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Sunflower seeds

Sunflower seeds are high in PUFA, with a total of 23.1 grams per 100 grams, most of it in omega-6 fat. They are a good source of vitamin E, thiamin, magnesium, copper, manganese and selenium.

PUFAs in sunflower seeds Sunflower seeds

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Sesame seeds

Sesame seeds are high in PUFA, with a total of 21.8 grams per 100 grams, most of it in omega-6 fat. They are a good source of calcium, iron, magnesium. copper and manganese.

PUFAs in sesame seeds Sesame seeds

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Flax seeds

Flax seeds are high in PUFA, with a total of 28.7 grams per 100 grams, most of it in omega-3 fat, contrary to other nuts. Even though they are high in omega-3 fat, the omega-3 is in the ALA form (alpha-Linolenic acid), which is a short-chain form that need to be elongated to EPA and DHA to be useful for the body. The body’s mechanisms to elongate ALA to EPA and DHA are very inefficient and ALA forms of omega-3 fats are not good sources of omega-3 for us. Unless you enjoy them, don’t go out of your way to eat them as they are not a great choice to get more omega-3 compared to fatty fish and grass-fed ruminant meat.They are a good source of thiamin and manganese.

PUFAs in flax seeds Flax

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A word on peanuts

Peanuts are in reality a legume and should be avoided. Other than a bad fatty acid profile, they are one of the most common food allergen, are loaded with antinutrients, high in lectins and are a source of aflatoxin, a known carcinogen.


We learned that even if they are often loaded with vitamins and minerals, most nuts and seeds should be kept to a minimum on a healthy diet for a few main reasons:

  • Most nuts contain lectins that can irritate the gut lining;
  • Most nuts also contain phytic acid that bind to minerals and blocks their absorption;
  • Most nuts are very high in total polyunsaturated fat and in omega-6 fat, two things that should be keept to a minimum;

Nuts like walnuts and pine nuts are some of the worst ones in terms of fatty acid profile.

A few deserve a special mention though:

  • Macadamia nuts, high in monounsaturated fat, healthy even in high amounts;
  • Chestnuts, starchy and very low in polyunsaturated fat, beneficial as a source of healthy carbohydrates;
  • Brazil nuts, high in omega-6 and total PUFA, but also extremely high in selenium and probably useful in small amount to get adequate amounts selenium;

We also learned that we can make the nutrients in nuts and seeds more bioavailable and mitigate the antinutrient properties in them by soaking them in salty water overnight.

I hope this will be helpful. In my case, in 2010 when I was diagnosed with my autoimmune disorder and told by a naturopath not to eat nuts, I had no idea why and so I would cheat a lot 😦 knowing and understanding why nuts are not good for me would make me a much better patient 🙂

To your health,



  1. ah this isn’t good news for me Looks liek i need to change my diet drastically but wow what a change it would be LOL


    • Hi Cathy, I feel the same way. I love nuts! Have them every day and quite a bit 😦 so same here – now I am working on easing out of my nut addiction 😉


  2. I have an autoimmune disease and did not realize I should not be eating nuts. I eat them almost every day. Looks like I need to stop….I’m a vegetarian with an autoimmune my choices are getting more limited. 😦


    • Since I also have an autoimmune disease and celiac, I was at the point where all I had left to eat were vegetables and fruit. I was vegan discovering that I can not do grains and legumes much (have to limit them as I do not digest them all that well) and later realizing that nuts are also not great, and on top of it dairy too :/
      So I have decided to add limited amounts of animal proteins in (eggs, fish, some turkey) and so now it is just like a plant-based paleo 🙂 where I definitely eats a ton of vegetables, some animal protein and some fruit….for me it is all about experimenting and eating the “not so good for you” foods on occasion and in moderation.


    • Thank you Julee, I also loved the info in this article, I tend to overdo the “good” thing, so that was a great reminder about moderation.


  3. Hi Elena! This was a very informative article. I love nuts and eat them with regular abandon. My only limitation has been the calories. Now I know I need to be careful of the lectins and phytic acids too. Yikes! Thanks for reading Three Dogs. I really enjoyed writing that one – tho after seeing the video, it wrote itself! I do hope you come again!


    • The video was just too funny! I had to share on FB, my kids loved it!
      And with nuts – with my research, I am more and more convinced that it is all about rotating your foods, and not eating the same thing every day.


      • I am beyond flattered that you shared that piece with your kids and on FB! And you are right about foods. I do the best I can but there’s always room for improvement. I could learn a lot from your blog –


      • Thank you! I love being able to share the information and love the blog platform for that purpose! Works great, good place for me to organize and keep for reference as well as helpful for others….


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