Also be careful about reasoning. I would be very curious as to why you should eat what a caveman ate. I can't see a compelling reason. If you follow a diet that excludes groups of foods (especially carbohydrates), you will likely lose weight because it's difficult to get the amount of calories you'd need to maintain our gain weight. A well balanced diet is harder because you have to focus on portion sizes, not exclusion. I would imagine the second one is healthier, but only because you're more likely to get a little bit of many nutrients. I have nothing to back that up
I'm no expert on the subject, but I can tell you the body has a myriad of checks and balances to keep homeostasis. These measures allow us to survive and thrive on very different diets.
A personal trainer has a certificate. A dietician has 5 years of university learning about anatomy, physiology, pathology, nutrition, etc.
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