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You probably feel better because you've lost weight. You could be eating nothing but Oreos and probably feel better after losing weight. Your blood panel would improve too.

I've been losing weight through simple calorie tracking. When I hit my daily limit I stop eating. I eat whatever I want. I've lost 22 pounds and feel great.

EDIT: Here's a nutritionist who improved his health markers eating nothing but junk food - http://www.cnn.com/2010/HEALTH/11/08/twinkie.diet.professor/