Only in the philosphical sense that you can not prove that yesterday existed, IMPOSSIBLE!
Oh, and it's been proven that merely eating junk food is not the source of poor health in overweight people: It's being sedentary. You could be quite fat, but as long as you maintain just about any level of exercise whatsoever, even just a half-hour walk per day, then you're going to be in much better overall health than a thin person who eats absolutely "perfectly" but gets no exercise at all.
I'm a fittness nut and I agree 100 percent. I love biking to work and lifting weights.
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