Yes but the enjoyment of that nutritious, delicious yogurt and then the satisfaction of running on the treadmill are both worthwhile rewards. You shouldn't look at it like a zero-sum situation where it's one or the other. You still have your BMR to consider, in that you need to feed your body a certain amount to keep it functioning at peak.
Wouldn't you prefer to eat yogurt and run, than not eat yogurt and sit around some more?