This article, by Samantha Cassety, was featured on http://www.NBCNews.com. It is a pretty thorough explanation of how we can and cannot affect our metabolisms…and just what metabolism is in the first place.
The conclusion is something that those in the Fitness industry have been saying for years: regular exercise is good for us but may not necessarily help us lose weight; our diet is most important to dropping those pounds. On our journeys to weight loss and fitness, we need to assess our approach: we have little control over how many calories our bodies will burn, but we have total control over how many we will put in our bodies!
A long-ish read but worth it!
Kosher Fitness 