Lentils

Lentils are the best two-for-one deal on this list, and the only top-five pick that seriously tackles the constipation that affects roughly 1 in 7 GLP-1 users. A 100-gram serving of cooked lentils provides about 9 grams of plant protein and a substantial 8 grams of fiber, much of it the soluble kind that softens stool and feeds the gut without the harshness of pure bran. They also deliver standout micronutrients exactly where GLP-1 users tend to fall short: roughly 45% of the daily value for folate and 18% for iron, the latter directly relevant to the iron deficiency Harvard flagged in a small but real share of users. UC Health and Cleveland Clinic both highlight legumes as core GLP-1 foods precisely because they hit protein, fiber, and blood-sugar stability simultaneously. The texture is forgiving, too: cooked soft, or puréed into a dal or a smooth soup, lentils are easy on a slow stomach and lend themselves to the warm, brothy meals that go down well on rough days. There is one real caveat — their high fiber can cause gas and bloating if you jump from little fiber to a large bowl overnight, so dietitians advise ramping up gradually (about 5 grams of added fiber per week) and keeping portions modest. Compared with animal proteins, lentils give up some protein density but add the fiber and folate those foods entirely lack; compared with other legumes, red lentils in particular cook fast and break down into the gentlest texture. For vegetarians especially, they are close to indispensable.