Eating vegetables in raw or cooked form is a highly debatable question since some vegetables are more nutritious when eaten raw while others are healthier when cooked.

Application of heat can destroy 15 to 20 percent nutrients in vegetables particularly, vitamin C, folate, and potassium whereas it can drastically increase the lycopene in tomatoes.

Asparagus, tomatoes, spinach, mushroom are more nutritious when eaten in cooked form whereas onion, beetroot, bell peppers are healthier when eaten raw.

The nutrient losses are highest when vegetables are cooked for a long time on high temperature using excess....http://www.themedarena.com/2015/05/best-ways-to-cook-vegetables/

Hey, eat onions raw