Meals do not mean it is rice. Small portions of good food rich with fibre should be taken in six portions.
Six meals in a day here mean small portion sized meals. You can practically double the amount of caloric intake without knowing if portion size is not controlled in each meal.
Smaller frequent meals do fire up your metabolism, burns more calories and provides frequent protein to prevent your body from dipping into a muscle wasting state.
Every person has a different body that works differently and so one should choose their eating habits accordingly.
Be it three big meals or six small meals a day, it is important that your metabolism works at a good pace.