Why child is a child trained to love sweet calorie rich food when it causes obesity & diabetes?

Sweets not problem. All depends how palatable the foods are usually sweets can be pretty addictive so it is easy prefer sweets than other flavors.
Sweets not problem. Children savor things given as treats because they taste good & are celebrated. When given @ every meal, the child begins to feel a sense of entitlement & the dietary deva's are created. Kids don't need sweets @ every meal or once a day. They should be part of balanced nutrition, not a reward. Sweets don't cause obesity or diabetes. Poor dietary practices and over indulgence may do so eventually.