While I am not a doctor, I have done plenty of diets, workout routines, and all of the latest fads. I've never been overweight or nonathletic. I just strive to get better and get as close to the best as possible. I haven't seen a drastic change with my performance or my physical appearance like I have with switching to a paleo diet and starting CrossFit. First, a little background about myself.
I have ran track all my life along with playing youth sports like football, baseball, and basketball. I was always skinny fat. I would run track and devour 3 double bacon cheese burgers and a large order of fries every day during the summer. I would get physicals that the most sports required and they always came back without any issues. My diet was terrible but I was active enough to maintain that diet without getting obese. As I got older, I started professional wrestling. I looked into bodybuilding and trying to gain (good) weight. I would lift some pretty good weight in the gym but never really leaned out. I began to get slower and less flexible as an athlete. It wasn't until very recently when I saw a friend of mine (the same friend I used to get those cheeseburgers with) who looked like he turned into the terminator. He looked like the fittest person on the planet. He wasn't huge in the bodybuilding sense, but he looked like he was powerful and healthy. I found out that he had joined his local crossfit gym and started following a paleo diet.
Fast forward to today, I follow a paleo diet of grass-fed meat, free-range eggs/chicken, vegetables, fruit, seeds, and nuts. I no longer count calories or macronutrients. I eat when I want to eat. While I've dropped from about 215 to 200lbs, I've begun the climb back up by doing something I love. EATING MORE! My waist went from a 38 to a 34 and I've been able to lift weights, lift my body, and lift my energy to a point that I have not experienced. All of this happening within a span of a couple months. While I won't say that everyone should do this (I do think everyone should), I will say that this has worked wonders for me. I don't always provide the links to the scientific studies that accompany what I say, I have done the research and have my own body as proof. If there are ever any questions, I'm here to help!