It is true that people throw away a substantial amount food from restaurants and houses in lots of countries because these food is stale and actually they would be harm to our organism. In order to mitigate this issue, people can be encouraged to consume fresh and organic products and government could do strict rules.
On the one hand, a majority of food consumers want to eat junk food, this is the reason why they buy lots of products which are not organic or fresh. A lot of junk food gives us a dopamine and people want to eat these kinds of food a lot and buy them for eat at home, however, few days later, these food start to go stale and people must be throw away from home. For example, my friend suffer from obesity and when I go to his home, he eat junk food and he always buy them a lot. it leads to waste of food.
On the other hand, In order to address this problem, people could be eat more organic food and fresh. When they eat fresh foods, they do not need to throw food. They buy enough products for them which they are enough during monthly or weekly. Also, government should do useful strict rules in order to reduce the amount of waste food and it might be helpful, people avoid to buy lots of unnecessary products. For example, the USA is one of the biggest countries and most people consume the substantial amount of food in there. Government could do strict rules in order to reduce waste food.
In summary, junk food and buying unnecessary product leads to waste of food, instead people eat organic and fresh food rather than junk food, also governments could do strict rules to reduce it.