Increase Metabolic Rate

How do you increase your metabolic rate withough exercising?
I recently had an accident and am not able to exercise. I may be out for 2-3 months, maybe longer. I was just wondering if there was any way that I could increase my metabolic rate.
Eat more frequently and eat large volumes of less calorie dense foods. Drinking water will speed up your metabolic rate temporarily by 30% per 17oz. drank.

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