I would think the only way diets would cause obesity is if they are unhealthy diets that end up altering the
body's metabolism rate. For example, severely restricting
calories below about 1200 a day (depending on activity level) can put your
body into "starvation" mode so that it will hold on to every single morsel of food put into it. Then once a person reaches their
goal and goes back to eating normally, they just put on all the weight over again.
A proper
diet, one that can be safely maintained long term (because in most cases losing weight through
diet changes SHOULD be a lifestyle change towards eating healthily), will not cause these effects.
What kind of
diet is your wife on? Its possible you have cause to worry, but also possible she's using a good
diet and is just trying to improve herself.
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