For millions of years our species ate what we might call for the sake of brevity a Stone Age diet. These 'hunter-gatherers' lived in the Paleolithic Age. We are separated in time from them by a 'mere' 10-12 thousand years. Our genes are our inheritance from those ancestors of ours, modified by natural selection over that geneological 'blink of a eye' since Neolithic, the New Stone Age, succeeded the old. This brought farming to the service of our kind. It was a mixed blessing: more food to feed more people, but a radical change of diet that caused some harm to the people who ate it.
The Paleolithic diet had mainly comprised meat, fish, nuts, non-starchy vegetables and fruit. The new foods of the Neolithic diet included cereals, i.e. grains. Grains make up such a large part of the modern day diet that it bears little resemblance to the hunter-gatherers' food of long ago and cannot logically be considered best suited to our species, the genes of which have not altered to suit it.
What 'food substance' have I not specifically mentioned? - SALT! - Salt is an even more recent newcomer to the modern diet. Humans started to eat added salt, it has been estimated, between 5,000 and 2,500 years ago, and in recent decades the food industry has, by adding copious amounts of salt to its processed foods, ensured that there wasn't a snowball's chance in Hell that our bodies could possibly adapt to so massive a change from the low sodium intake of our ancestors to the very high sodium intake of our societies today.
The outcome is that modern food is unsuitable for the health and nutrition of most people today and this partly explains the growing incidence of what we have come to think of as the new diseases of civilisation - diabetes, hypertension, heart disease, cancer, arthritis, stroke, dementia, etc. And of obesity.
The even more recent scourge that is afflicting our species is the rapidly increasing ingestion of pharmaceutical drugs recklessly prescribed by an over-powerful medical profession, under-informed about the harm their prescriptions do to their unfortunate patients.
You could improve your health, rapidly and immediately, by seriously cutting down on your intake of salt and salty food, by cutting down on sugar and cereals/grains, and by avoiding prescription drugs unless they really are necessary. - Why not start in this way to improve your health this very day? - You have nothing to lose but excess weight, some avoidable pain, and the unnecessary risk of degenerative illnesses. - I wish you Good Health!