Most things in life tend to be a reaction after an event and what happens after is the 'cure'. It would be better if the event did not happen at all?
One theory is the food industry makes us sick so the drug industry can sell us a cure. It has been suggested but the evidence to support this is a challenge and in a complex world, it would be hard to prove.
Conspiracy theories aside, there are things we can do to improve our own lot. Eat fresh foods, reduce processed foods and exercise, are a few.
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