You probably already know that getting too little sleep is bad news for your waistline, but a BYU study of over 300 women found it’s not just the amount of sleep that counts (though between 8 and 8.5 seems to be the sweet spot). The real key is sticking to a sleep schedule. Women who went to bed and woke up at the same times every day had lower body fat, on average, across the board.

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