Shape Magazine Bad Advice?

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I was just reading an article about 50 ways to lose 10 lbs (just cause I was interested in what they had to say) Number 6 was:

"Diet 2 days a week. If you can't stick to a program all the time, try slashing your calories to 650 a day just 2 days a week and eating normally the other days. A recent study suggests this offers protection from breast cancer as well as assistance with weight loss."

Is this horrible advice, or is it just me?

Read more: http://www.prevention.com/weight-loss/diets/how-lose-10-pounds#ixzz22VtuBmIx