It all comes down to the need to survive for those one has to take care of and for those that need us, children, spouse, parents. One learns to eat safe food, food that one knows won't harm them or one simply eats with people who they trust.
because they have all the essantial needs in the food you eat what you eat to stay alive you can also eat just because of the way it tastes or to eat not because you want to or to stay alive but to...
The horse is an herbivor, which means he only eats plant life, grasses mostly. If no grass is available they will need hay and some kind of grain to make sure they get all the nutrition they require....
you are what you eat is the corect way to say it because if you eat something unhealthy then you are unhealthy and if you eat something healthy then you are healthy.