Lentils rich in protein have many nutritional value. For example, for every 100 grams of lentils, the water content is: 12.4 grams , minerals: 2.1 grams , fiber : 0.8 grams , dietary energy is 343 kcal , meat: 25.1 grams , fat: 0.8 grams , calcium 69 mg , iron: Contains 4.6 mg , carotene 280 micrograms , vitamin B-2 49 mg , sugar 59.0 g. As a result, if one normally eats lentils every time, then the chances of belly growth are much higher. So if you want to reduce belly, reduce the amount of lentils eaten. But yes, eating lentils once a day as a protein is good for health. You can also exercise regularly to reduce the problem of abnormal belly growth. Hopefully it will work. Thanks