How to correct the food habits in teens and youths to prevent frequent health problems in them?

This is with reference to the habit of avoiding / refusing home food and craving to eat out and for junk food.

Straight solutions without beating round the bush - please

Give fresh / healthy/ home cooked / local / seasonal food which can be chewed. Use more boiled / roasted food.
Avoid fried, old / fast /non-seasonal food, tea etc.
You can start eating positively and teens / youths will follow you. Ask you husband etc. to follow natural food habits.

make em do pushups. Show them propaganda pictures like the military, such as this is what you will look like in 20 years or things like that and by the way you could become a better cook because restaruant food sucks.
where are they getting the money to buy the junk food? If it is from you then you have to take the blame. If they only have access to healthy food then they will eat rather than go hungry.
the answer is in your qn

"This is with reference to the habit of avoiding / refusing home food and craving to eat out and for junk food. "
chane to home food, you will find the difference.