Six popular myths about healthy diet get debunked
cartesianproduct.wordpress.com
cartesianproduct.wordpress.com
We know so little about proper nutrition, especially in the context of obesity and fitness that anyone who tells you they have the "answer" is probably just trying to sell you something.
Everyone's metabolism is just slightly different for there to be things that work for them and not for others. Experiment and track your results.
I used to think I was gluten-intolerant, now I'm not so sure.
What I do know is that alcohol isn't good for my digestion and sugar in high doses causes me to gain body fat. When I eat meat, fish, vegetables, and small amounts of carbohydrates from rice and potatoes, I get stronger, feel better, and have fewer problems with digestion.
My wife can't touch bread or she'll be sick for a day. She had crazy vitamin deficiencies and hormone dis-regulation from years of eating low fat meals, gluten-heavy food, and not enough protein. Six months, and 50 lbs of body fat loss later, she's feeling better than ever with a greatly improved mood.
YMMV.