Our expert says:
It is difficult to judge if your girlfriend's symptoms are being caused by her diet because you don't mention what kind of a slimming diet she is using. Unbalanced, high-protein, high-fat diets could cause such symptoms. Very-low-energy diets would also make her feel weak and nauseous. However, these symptoms could also be due to an underlying physiological problems such as a urinary tract infection, so I would recommend that your girlfriend should have a medical checkup just to make sure that she is not suffering from any illness that needs treatment.
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