Can it be harmful to try other diets?

Hi, My sister had an RNY open and has lost 120lbs. in the past 10 mos. but lately she hasnt lost any for 1 mos. She is talking about trying the Hollywood Diet that is out. This is like a grapefruit juice I think. Do you think this is wise? Will it hurt her. She just wants to jump start her weight loss again and it says that you can lose 10 lbs. in 48 hours. Help!!

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