250 Calories per donut
100 Calories per mile walked ( it might be more if obese )
If walking at 3 miles per hour burns 300 Calories
Then if you eat a donut you have to walk an extra 50 minutes
It is easier to not eat the donut
Since running or any high calories exercise if you are obese hurts the joints you are very limited in how much weight you can lose by exercising per week if you are obese
Obese people will use exercise as an excuse to eat junk food