Full confession: I love to read about brown fat, a relatively newly discovered form of fat that burns calories directly. Brown fat might be the key to weight loss, writes Alice Park, who covers breaking health news for TIME magazine. Last week, she published, Why Brown Fat May Be the Key to Weight Loss. Kudos to TIME for covering valuable research (when others did not.) But there’s a lot more to add. First, some words about brown fat.
The body makes two kinds of fat: white fat, familiar to all, the storage form of energy, and brown fat that is not stored but burned directly as fuel. When triggered by exposure to the cold, brown fat generates heat (white fat just sits there). Hibernating animals produce brown fat to stay warm during the winter. Newborn babies have lots of brown fat, their own little furnaces, to protect against the cold. We used to think that adults could not make brown fat, but now we know everyone can turn white fat into brown when there is need.
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