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Potatoes are not automatically unhealthy when eaten often. They are a starchy vegetable that can provide potassium, vitamin C, carbohydrate, and fiber. The bigger differences come from portion size, frying, added fats and salt, and whether the meal includes vegetables and protein.
Yes. For most people, soy foods such as tofu, tempeh, edamame, and soy milk can be part of a daily diet. Current human evidence does not show that normal soy-food intake increases breast cancer risk. Concentrated isoflavone supplements are a separate category and should not be treated as nutritionally equivalent to a serving of tofu.
A small serving of cheese can fit into a daily diet, but type and portion matter. The American Heart Association recommends two to three dairy servings per day and favors fat-free or low-fat options. About 1.5 oz of hard cheese counts as a dairy serving; full-fat hard cheeses can provide useful protein and calcium while also concentrating saturated fat and sodium.
Yes. For most people, a daily 1 oz (28 g) serving of unsalted nuts can fit well in a healthy diet. The American Heart Association uses 1 oz as a standard serving. Depending on the nut, that portion provides roughly 155–200+ calories, so replacing another snack is different from simply adding nuts on top of everything else.
Yes. For most people, beans, lentils, chickpeas, and other legumes can be eaten every day as part of a varied diet. One cup of cooked lentils provides about 18 g protein and 16 g fiber. If you increase legume intake quickly, the sudden rise in fiber and fermentable carbohydrates can cause gas or bloating at first.
For most people who tolerate dairy, eating yogurt every day can fit a healthy pattern. The useful comparison is not yogurt versus no yogurt, but plain versus heavily sweetened products, protein content, fat level, serving size and how the rest of the diet is structured.
For healthy people, up to one whole egg per day can fit a heart-healthy dietary pattern. A large egg provides about 6–7 g protein and roughly 70–80 calories, plus close to 200 mg dietary cholesterol. Current American Heart Association guidance emphasizes the overall dietary pattern and saturated fat rather than treating dietary cholesterol as the primary cardiovascular target for most people.
On average, many plant proteins are somewhat less digestible than animal proteins, and some provide lower amounts of one or more essential amino acids. But there is no single plant-protein “absorption percentage”: soy, tofu, tempeh, whole legumes, grains, and protein isolates behave differently. A varied plant-based diet can fully meet protein needs.
The best protein source without meat depends on what your diet still includes. Fish can provide more than 30 g in a serving; eggs and dairy make vegetarian meals easier to build; soy foods, seitan and legumes give vegans options ranging from roughly 16–18 g per substantial legume serving to 20 g or more from concentrated choices.
The U.S. adult RDA is 0.8 g protein per kg of body weight per day: about 48 g at 132 lb, 55 g at 150 lb, and 66 g at 180 lb. On a vegetarian diet, spreading eggs, dairy, legumes, soy foods, and grains across meals can meet those amounts comfortably for most healthy adults.
A vegan diet can meet protein needs without perfect protein combinations at every meal. The U.S. adult RDA is 0.8 g/kg/day, about 55 g for a 150 lb adult. The simplest strategy is to include 3–4 strong protein foods each day, such as tofu, tempeh, legumes, textured soy protein, seitan, or soy milk.
Cooked mature soybeans are among the highest-protein legumes, with about 18 g protein, 9 g fat, 6 g fiber, and 172 calories per 100 g. Dry soybeans exceed 35 g protein per 100 g, but that number is not directly comparable because cooking adds water and increases weight.