Non-Exercise Activity Thermogenesis (=NEAT) refers to the energy you expend through spontaneous movement and basic activities in your life. Think about walking your dog or walking up the stairs to your office.
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There's research showing NEAT varies substantially across individuals [1]. One study found that variances in NEAT can be as large as 2000 calories per day between individuals of similar body size (when comparing highly active vs highly inactive individuals) [2].
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This helps explain why some people seem to have a much "faster metabolism" than others, they likely are just more active throughout the day. Therefore, being more conscious of your non-training activity can help if you feel like you have a "slow metabolism."
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Examples of how you can do this include taking the stairs more often or going for a walk every day. Especially during this time that we are seated at home a lot more than usual, it is beneficial to pay mind to your activity levels outside of training.
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References:
1. International society of sports nutrition position stand: diets and body composition | Journal of the International Society of Sports Nutrition | Full Text
2. https://onlinelibrary.wiley.com/doi/1...2007.01842.x/f