I've tried to ignore all the food claims as I've gone through life. If we do anything it's to prefer basic foods over processed. The longer the ingredient list, or the more packed with sugars, the less likely it is to go in the trolley. I never switched from butter and full fat cheese as the alternatives taste terrible, the other half tried low fat spreads for ages, but hated them.
As we've done more cooking and baking we've rediscovered how poor most of the mass produced ones are. Especially bread and cake.
At 50 after the age related checkup, my blood work was excellent. Proves little of course. I still got the lecture on low fat though! I suspect everyone has to get it.