Why you need staple foods in your diet?

Answer 1

We need a staple such as rice, potatos, or pasta because they supply fibre, and also we need carbohydrates. If we ate nothing but meat, the body would burn much of the valuble protein, rather than store it and use it to build and repair the body.

Breaking down proteins into starches and sugars produces urea and other nasty biproducts, and staples are a ready-to-go fuel.

we don't need staple food:

All staple food can easily be replaced by vegetables, that are richer in fibre and just as well packed with carbohydrates. More over, most vegetables consist of 'slow' carbohydrates, which are better for the human body than the 'quick' carbohydrates present in many types of staple food, like potatoes, white rice, and non-whole grain pasta and weed. Whole grain pasta, whole grain weed and brown rice however, are also released slowly in the body and are just as healthy as vegetables.

That said, staple food is easier to store, since it can be kept for months, even years without deteriorate. It is also cheaper to produce. Quick carb staple is also useful to consume right before or right after high activity sports, because the body needs a lot of energy at once to replenish reserves.

quick (or simple) vs slow (or complex) carbohydrates

Quick carbs are burned fast and release all its energy at once in the human body. Unless you are doing an activity that needs a lot of energy like sports, this excess energy will not be fully consumed by the body, and so parts of it will be stored as fat. Slow carbs on the other hand, are harder to digest and release energy slowly, giving the human body a moderate amount of energy during a longer period of time. More of this energy will be consumed by the body, and thus less of it will be stored as fat.

Because quick carbs are burned fast, they give quicker a hungry feeling than slow carbs. Also, quick carbs are addictive - the quickest carbs of all is sugar - leaving some people over eating themselves easily.