re: Plant based diet?

I am from south india. We only eat meat on Sunday. Our breakfast are usually from batter made of rice/black gram/lentils. We eat vegetable curries for lunch. We have snack for tea mostly veg. Most of the Indians are not super fit but at the same not obese. We walk a lot to get to places. since we eat often, metabolism might be higher. Plus all the food is from fresh produce. Not processed food.