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why have traditional diets failed to people maintain a healthy weight?
o a. they do not incorporate long-term lifestyle changes.
o b. they are too difficult because they restrict too many calories.
o c. they do not include exercise.
o d. they are fad diets.
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b. they are too difficult because they restrict too many calories.

Explanation:

according to resources, " current strategies to tackle obesity which mainly focused on shedding calories... Are failing to help the majority of obese patients to shed weight and maintain that weight loss."

the answer should be c