![]() A person with a "high metabolism", stranded on a desert island with little to eat, is worse off than someone with a normal metabolism. In terms of natural selection, this is not a good thing. They are either not absorbing the maximum possible food energy from what they eat, or they are losing more energy than necessary to heat during the conversion process from food to useable ATP, or their body's baseline energy demands are simply higher than they need to be (such as in hyperthyroidism). So, if a person can eat more food calories than another person of the same dimensions while both are maintaining their weight and both have similar activity levels, he or she must be more metabolically inefficient. Generally, our bodies are very efficient, evolution has ensured that we are, because it's advantageous for survival to be able to persist on as little food as possible (and of course, to store the excess as fat for later use). The more efficient your metabolism, the more energy you are able to process and extract from a given amount of ingested food energy, or the less energy your body needs to achieve a given level of activity. See the Related Subreddits section for other popular fitness-related subreddits.General Posting Guidelines (click for more info): No Questions Related to Injury, Pain, or Any Medical Topic Progress Posts Must Be Detailed and Useful ![]() Posts Must Be Specific to Physical Fitness and Promote Useful Discussion No Threads That Are Answered by the Wiki, Searching Threads, or Google ![]() Welcome to r/Fitness! Click Here for a one-stop shop of our most important resources.
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