A cohort study of nearly 10,000 US adults tracked over 19 years found a striking pattern in legume eaters.
Those who ate legumes four or more times a week had a 22 percent lower risk of coronary heart disease than those who ate them less than once a week, Harvard's Nutrition Source reports.
Lentils sit inside that legume family. The same Harvard page ties them to three related effects on the body, on cardiovascular risk, blood sugar and the gut microbiome.
The same analysis also flagged an 11 percent lower risk of broader cardiovascular events like stroke and heart attack combined.
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Why the heart number matters
The signal has held up in other work.
Harvard cites a meta-analysis of eleven clinical trials on pulses, the dried seeds of legumes like beans, lentils and peas.
Regular intake lowered total cholesterol by about 7 percent and LDL, the type linked to plaque buildup, by 6 percent. HDL, the protective type, rose by 2.6 percent.
These are modest shifts on their own. They are also the kinds of changes seen when lentils become a daily habit rather than an occasional side dish.
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What resistant starch does to your blood sugar
Lentils have a low glycemic index of 26, according to testing published by the Glycemic Index Foundation.
That means the carbohydrates in a serving are absorbed slowly and produce a smaller rise in blood glucose than faster starches like white bread or potatoes.
Part of the reason is resistant starch, a form of carbohydrate that resists digestion in the small intestine and reaches the colon largely intact.
It is the same mechanism that turns lentils into gut fuel.
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A small randomized trial of 30 middle-aged overweight adults, published in Nutrition Research in 2022, found something worth noting.
Eight weeks of regular lentil intake slowed the progression of insulin resistance compared with a lentil-free diet.
Insulin resistance, when cells respond less effectively to insulin, is an early step toward type 2 diabetes.
Feeding the microbes in your colon
Once resistant starch reaches the colon, it becomes food for beneficial bacteria such as Bifidobacteria.
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Harvard's Nutrition Source describes pulses as a prebiotic that feeds gut flora and ferments in the lower digestive tract.
The fermentation produces gas, which can cause bloating in some people, especially at first.
That side effect tends to ease as intake becomes routine.
Split red or yellow lentils are usually gentler than whole green or brown ones, and building up gradually helps.
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How to cook them without a soak
Lentils are one of the quickest legumes to prepare, with no soaking needed.
Whole varieties like green, brown and black take about 20-30 minutes in simmering water or stock.
Split red or yellow lentils are done in 10-15 minutes and collapse into a soft texture that works for dals and soups.
Before cooking, tip the dried lentils into a strainer, pick out any small stones and rinse well.
For firmer lentils to add to salads, cut the time by a few minutes. For a softer, spoonable dish, cook a bit longer.
Dried lentils keep for about a year in a sealed container in a cool, dark cupboard.
Cooked lentils hold for a week in the refrigerator or up to three months in the freezer.
This article is made and published by Ida-Marie Palm Varbæk, who may have used AI in the preparation.