Question

coarse grains have high nutritional value still why is not widely cultivated and consumed in India​

Answer 1

Climate is more suitable for rice and wheat

coarse grains are expensive

they require modern methods of cultivation

Answer 2

Farmers usually get high MSP (Minimum Support Price) for rice and wheat so, farmers tend to grow those crops. This causes inflation in the price of coarse grains. Thus, poor people won't be able to buy and consume coarse grains. These are the main reasons for the given question.