Some will "go on a diet" to feel better about themselves, others because of health concerns or because it is trendy. What is a diet really, what are the risks? What type of diet can you trust?
According to the definition in the dictionary a diet is “the kind and amount of food prescribed for a person […] for a special reason” (Merriam Webster).
Extrapolating and reformulating the definition, is it reasonable to ask whether eating anything with no limits and no restrictions is not itself defined as a diet? Is the modern kitchen not a "2.0 system" which restricts the body to cause some deficiencies in the long term?
It is difficult to answer this question because it depends on what scale or time referential the individual is placed. On a large enough scale, how do you qualify the diet of people who follow a "Paleolithic diet" or "Okinawan diet"? Can we still talk about "going on a diet" strictly speaking? One certainty, our ancestors did not know ready-made prepared meals, chemical additives and flavour enhancers that appeared in the last 50 years.
Genetic mutations are slow, for a disease or to adapt to climate change, it takes time.
The lifestyle and diet mode do not match the genetic fingerprint recognized by our genes.
Many scientific works show a simple and theoretical link of causality between modern kitchen and chronic illness.
"The fouling theory" or "blood type regimes" show very clearly that each individual is not the same.