re: PuttaDaForkDown

You can't say either are 100%. Sure I could eat whopper's every day for a month then switch to a healthy balanced diet and I'll loose weight. But it's because my body isn't taking in crap anymore. I'd say diet is 75% and exercise is 25%. It depends on the type of exercise you a doing as well. Lifting a certain way will have you gain weight due to muscle build.
And the amount of sweating has nothing to do with it. It's all about keeping your heart rate elevated for an extended period of time.

Tl;dr: I disagree. I say 75% diet, 25% exercise

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I'll get e-grief for this comment for the tenth time but I think diet is closer to 100% responsible for weight loss. exercise is for health/fitness. Doing both is better for your health. Every morning going to work I see massive people running/jogging/walking trying to sweat out the terrible diets they are on.

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The role and importance of exercise , namely resistance training , depends on if your focus is more on just weight loss or body recomposition. I would think the overwhelming majority would be more concerned with the latter. If that is the case, resistance training is crucial. Heavy weight training during dieting helps you maintain more lean mass while reducing bodyfat levels.