Most people become metabolically sick. That need not be the case, but it is "normal" and being normal in that way is to be avoided.
The root of metabolic syndrome is your diet. We know that old ideas, like being vegetarian, and eating everything in moderation and eating the rainbow, have no scientific support. There are better ways.
Open Future Health has many personal examples like the one Dr Unwin had, where a single "naughty" patient taught him that people could reverse their diabetes.
This is worksheet two of eleven. Collect the set.