it is easy to wreck a strong exercise regimen with a bad diet.

and, it is impossible to wreck a good diet with a bad exercise regimen.

The diet vs. exercise debate has been in the spotlight since an editorial in the British Journal of Sports Medicine earlier this year caused a stir with its authors' blunt message: Physical activity does not promote weight loss.

"You cannot outrun a bad diet," they wrote. "Many still wrongly believe that obesity is entirely due to lack of exercise."