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Let them eat legumes

Nutty professor

Vic and his bride.

Peanuts brought author Katch and his bride, Heather MacKenzie, together. (Image courtesy of Victor Katch.)

Thirty-one years ago, on a lazy July afternoon, I was sitting at the legendary Del Rio bar on Washington Street in downtown Ann Arbor. As I did every Sunday, I listened to jazz and had a bite to eat with a cold drink. I usually sat at a back table, but this time I had to sit at the bar. I was minding my own business, munching on a bowl of peanuts as I waited for my food to arrive when a woman sat next to me. I didn’t know it at the time, but this encounter would change my life.

I noticed her eyeing my peanuts, or so I thought. Politely, I asked her, “Would you like some peanuts?”

Her response was a polite, “No, thank you.”

A few minutes later, I noticed her eyes were back on my nutritious snack of delights. Again I asked her, “You sure you don’t want some peanuts?” And again, another polite, “No, thank you.” But this time she followed it by saying, “Peanuts are not good for you!”

“Oh, I think they are!” I said.

“You’re wrong!” she responded.

“Really?” I said.

I could tell she was getting irritated. “How do you know? Did you write a book on it?” she asked.

I smiled in spite of myself. “Well, in fact, I did.”

We struck up a conversation — about food, of course. After a while, we decided to go out for ice cream. We both ordered a decidedly unhealthy triple chocolate chunk cone. We got married at the Michigan League about a year later.

Peanuts are legumes


Peanuts are classified as a grain legume of the family Leguminosae, also known as pulses.

Peanuts are classified as a grain legume of the family Leguminosae, also known as pulses. The word pulse comes from the Latin word, puls, which means seeds that can be made into a thick meal (porridge). Other well-known legumes include alfalfa, clover, peas, chickpeas, lentils, beans, mesquite, carob, soybeans, and tamarind.

Legumes produce a unique type of dry fruit that develops from a simple carpel and usually opens along a seam on two sides. A common name for this type of fruit is pod.

There are thousands of different species of legumes. The most popular legumes are listed in the table below and include chickpeas, beans – including butter beans, navy beans, cannellini beans, red kidney beans, adzuki beans, black-eyed beans, and soybeans – peas, lentils, and lupins (yellow lupini beans). Legumes come in a variety of shapes, sizes, and colors. One can consume them in many different forms, including split, ground into flours or dried, and canned.

Common Legumes
Beans Most common variety of legumes. Includes adzuki beans, black beans, soybeans, fava beans, garbanzo beans (chickpeas), kidney beans, and lima beans. Beans are high in protein and carbohydrates and low in fat.
Nuts Some legumes are inappropriately called “nuts.”  The most common example is the peanut, with other examples including soy nuts and carob nuts. Similar to other nuts, these legumes contain high concentrations of protein, fat, and carbohydrates.
Peas Includes green peas, snow peas, snap peas, split peas, and black-eyed peas. Similar to beans, peas contain high concentrations of carbohydrates and protein but little fat. Most varieties have a naturally sweet flavor.
Lentils With a flat, round shape, lentils differ from other legumes. Whether yellow, orange, green, brown, or black, the nutritional profile of lentils does not change with their color.

Are peanuts really good for you?

Peanuts are a convenient source of protein and come with the bonus of healthful nutrients, such as iron, magnesium, fiber, and antioxidants (see the Health Yourself column “Antioxidants and Health”). Most fats in peanuts are heart-healthy mono- and polyunsaturated fats, which can help lower “bad” LDL cholesterol. And numerous observational studies have found that eating peanuts associates with many heart-healthy benefits.

A recent 2017 study of more than 210,000 people found that those who ate two or more servings of peanuts per week (typically, one serving of peanuts equals 1 oz. or roughly 28 peanuts) saw a 13 percent reduction in risk of cardiovascular disease compared with those who didn’t eat peanuts. Another 2017 study found that people who ate the most nuts — including peanuts — gained less weight and had a 5 percent lower risk of becoming overweight or obese over the five-year study period, compared with those who didn’t eat them. Other studies support these findings.

Peanuts compared with other nuts


Some legumes are inappropriately called “nuts.”

Each type of nut has specific health perks, which is why it’s good to eat a variety of types. Peanuts have about the same number of calories as almonds, cashews, and walnuts, but they possess more protein (with 7 grams per ounce, they have nearly twice as much protein as walnuts, for example), and are second only to almonds in terms of fiber (2.4 grams vs. 3 grams per ounce).

While walnuts are rich in heart-healthy omega-3 fatty acids, peanuts stand out for their arginine content – an amino acid that helps improve blood flow by relaxing constricted blood vessels. Plus, peanuts require less water and are easier to grow than tree nuts, making them less taxing on the environment — and your wallet.

How you eat them matters

One can eat peanuts in many ways: salted vs. unsalted, blanched vs. unblanched, shelled vs. unshelled, or mashed into peanut butter.

Beneficial antioxidants and phytochemicals are most concentrated in the peanut’s thin, papery skin, so eating them with their skins intact is best. Consuming them raw or dry-roasted as opposed to blanched — which removes the skin — is best, according to some experts.

Be on the lookout for peanuts with added sugar. For example, some packaged peanuts contain large quantities of added sugar. A 10-oz. canister of Planters Flavored Peanuts Sweet & Crunch contains up to 13 grams (roughly 3 teaspoons) of sugar. That’s about half the daily maximum recommended amount of added sugar for women, a third of the maximum amount for men.

What about peanut butter?

Peanut Butter

A 2-tablespoon serving of peanut butter contains about 14 percent of the daily need of magnesium.

A 2-tablespoon serving contains about 14 percent of the daily need of magnesium, which might aid with glucose metabolism, help build bone density, and lower risk for diabetes and stroke. Many studies on the health benefits of peanut butter do not show consistent results. But this may be due to the way it’s commonly consumed, usually with white bread and with jam high in sugar. Also, extra ingredients typically added to peanut butters — salt and sweeteners such as honey and sugar — may be responsible for canceling out any health effects of peanuts alone.

How to eat peanuts

You can mix nuts into most of your meals. Chop and sprinkle them into salads, stir-fries, sandwiches, and grain bowls; or whisk them into smoothies, soups, or dips.

Be sure to read nutrition labels to avoid packaged nuts with excessive added sugars, preservatives, and salt, and compare brands and flavors. Avoid peanut butter with hydrogenated oils, which can raise the risk of heart disease, type 2 diabetes, and stroke.

A nutritional winner

A comparison of four typical snacks shows why peanuts are a nutritional winner. They even may help you find a partner. They did for me!

Nutritional comparison of four common snacks equated to 100g portion size
Peanuts, raw Pretzel, hard, plain, salted Potato Chips made from plain dried potatoes Yogurt, plain, whole milk
Amount 3.5 oz. (100g) 16 twists (100g) 3.5 oz. (100g) 1/2 container (100g)
Total Calories

From Carbs

From Fat

From Protein

















Fat 49.2g  2.6g 38.4g 3.3g
Saturated fat 6.8g  0.5g 9.5g 2.1g
Monounsaturated fat 24.4g  1.2g 7.0g 0.9g
Cholesterol 0 0 0 13.0mg
Polyunsaturated fat 15.6g 1.1g  13.6g 0.1g
Omega-3 FA 3.0mg 74mg 93mg 27mg
Sodium 18.0mg 1357mg 388mg  52mg
Total carbs 16.1g 79.2g  52g  5.3g
Dietary fiber 8.5g 3g  3.1g  0
Added sugars 4.0g 2.8g 1.1g 4.7g
Protein 25.8g 10.3g  4.5g   3.5g 
Vitamin E 8.3mg  0.4mg 11.4mg  0.1mg
Iron 4.6mg 5.2mg 0.8mg 0.1mg 
Magnesium 168mg  29mg 43mg 12.0mg 
Source: SELFNutritionData.


  • Ahmad Alkhatib, A., et al. 2017. “Functional foods and lifestyle approaches for diabetes prevention and management.” Nutrients, 2017;9 (12):1310.
  • Freisling, H., et al. 2018. “Nut intake and 5-year changes in body weight and obesity risk in adults: Results from the EPIC-PANACEA study.” European Journal of Nutrition; 57 (7):2399.
  • Guasch-Ferre, M., et al. 2017. “Nut consumption and risk of cardiovascular disease.” Journal of the American College of Cardiology; 70 (20):2519.
  • Polak, R., et al. 2015. “Legumes: Health benefits and culinary approaches to increase intake.” Clinical Diabetes; 33(4):198.
  • Odeyemi, S., et al. 2018. “Medicinal plants used for the traditional management of diabetes in the Eastern Cape, South Africa: Pharmacology and Toxicology.” Molecules; 23(11):2759.
  • Shalini, S., et al. 2016. “Peanuts as functional food: A review.” Journal of Food Science and Technology; 53(1):31.


  1. Linda Spencer - 1987

    Why does Dr. Gundry think peanuts are detrimental?


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