While a low-carb diet is usually safe for most healthy people, it’s not for everyone, and there may be some initial side effects while your body adapts. Typically when you first start a low-carb diet, you might experience the following:
 Diarrhoea
 Constipation
 Poor energy and mental function
 Increased or decreased hunger
 Sleep issues
 Nausea
 Decreased exercise performance
There are some people who shouldn’t eat a low-carb or low-calorie diet full stop, such. As with any new diet, it’s important to talk to your doctor before starting.