are we what we eat?

I was listening this morning to another story about what we need to eat, what vitamins we need, etc. My father used to say “We’re all just a bunch of chemicals in a big bag,” and paying attention to our particular chemical make-up may be the most important thing we do. We all know that fresh fruits and veggies are good and refined sugar is bad. Why then, are there so many reports about what is good for us and what is harmful? Because we are all different. Fresh strawberries are wonderful- unless you are allergic to them. We must learn over our lifetimes what works for us, and all this health advise should be viewed as guidelines rather than rules. The concept of normal, too, is confusing.
It is normal that we are all different from one another- so different is normal.