That said it's true to say and that weight does have an effect, chiefly if one is overweight, but still this isn't the end of the world and there's still hope.
The proper method to know how fit one is to see endurance levels one has and how much workout one can carry out without getting exhausted. It's easily observed as one starts an exercise program and starts to become fitter the weight will start coming off.
Eating right is an important part of getting in shape, but it is not most important way to attain weight loss. If the aim is to reduce and not to again put on weight, one would need to examine the amount of exercise one does. Eating is important too but what's more important is to burn off the calories one gets off food, so long one is able to work out enough to burn sufficient calories one can have anything one likes . Finding time in one's daily schedule and eating healthy foods, are two different sides of the same coin and they have to go together.
Exercise not just burns calories but also helps one achieve shape and power it tones up differentmuscle segmentsit's not advisable to begin dieting without exercise because if that is carried out one burns muscles and not fat, leading to weight loss but not fat loss, and in fact the body will burn significantly less fat as there is less of muscle mass now, which would mean harder to lose weight in future if ever one needs to.
Remember getting fit takes time and patience and both exercise as well as watching one's diet goes hand in hand.