snore-sleep apnea-too tried too excerise-gain weight-
therefore, anyone snores should eat less and exercise more.
confuse the reason and the effect.
It's more likely that overweight person is more inclined to snore and there are other factors which influence one's weight.
Even if snoring contributes to one's weight, not everyone who snores has the sympton of apnea at the same time so too tired to excersice cannot prevent people from gaining weight for those who don't have apnea.
Moreover, it's unfairly to assume that the every snorer would necessiarly eat a lot and rarely exercise.