It would mean less deaths in areas with many hungry people now. With enough food, people can work more efficiently, contributing to economic growth of the country, allowing their standard of living to improve.

Those hungry people would not need to worry about finding enough food to feed themselves and their families. They would probably enjoy their lives more?

From what I know, current food production rate is able to feed everyone in the world. The problem just lies with the distribution of food to various parts of the world; some would receive more while others receive less - inequality.

It would be a good thing if world hunger can be solved.

I should say it is the responsibility of the school as well.

Given that many parents are working (not at home for most of the time), they are less likely to mind what their children are eating. So schools should play their part in ensuring students eat healthily, through lessons, lunch breaks etc.

(They can try making veggies look appetizing?)

Yes, junk food should be banned. Healthy eating habits should be trained from young, so that students will continue to make better food choices when they are older.

Firstly, junk food is more expensive than the healthier food sold in school. If junk food is not banned, then students may eat them most of the time, they would spend much more money. Parents would have to give their children more for their pocket money. So it would be better to ban junk food in public schools.

As shown by much research, junk food can lead to obesity and many health problems, like high blood pressure and diabetes. Even though a child may appear 'healthy' now, he/she may experience obesity-related problems, then he/she will have to spend more money on medical treatment in the future. Being fat also makes one less confident in oneself.