A healthy diet is a diet that is inclusive of all food groups and is varied. It’s a good idea to include fruits & veggies, whole grains, healthy proteins, healthy fats, and of course the occasional treat like ice cream or cookies !
No one can study with an empty stomach. You need at least fulfil their food needs or every man capable of working will be sent to the field. If the government can erase poverty, the citizen can start to look at other than fulfilling basic life needs like education.
Enough food is also needed for brain development. Poverty in neonates and child can cause impaired intelligence later in their life.