Research suggests eating 1/2 cup of lentils daily gives you steadier blood sugar, because they moderate rapid fluctuations in glucose and insulin levels. Lentils are said to help reverse prediabetes in as little as a month. Other Studies have shown that people who eat a diet rich in lentils and beans are less likely to gain weight. Lentils are a good replacement for starchy foods such as pasta. Sneak them into soups and sauces. Lentils are high in protein and a good source of vitamins.