But I eat very little Often, overweight people believe they eat very little and still put on weight, hence the 'slow metabolism' theory, but research has shown people tend to eat more than they think.
When asked to write down everything they've consumed in a day, people tend to report eating far less than they actually do. This may be to impress the researcher or because they genuinely forget to include some items.
On the day they recorded their intake, they may even have chosen lower calorie foods than they'd normally eat.
The bottom line is you'll gain weight if you consume more calories than your body needs. This can be a difficult fact to face, but recognising the need for change is vital for successful weight loss.