Unless you're Michael Phelps, you can't exercise away a bad
diet.
Even a full marathon for me burns only 2500 calories, tops.
Yeah. End of the day, you still have to eat less.
You need an average daily caloric deficit of about 500 to
lose any significant weight.
So assuming that a person needs 2000 calories (and most people
don't even need that much, especially females) to maintain his
or her current weight, he or she should eat 1,500 calories
daily for a week just to lose half a kilo. now that sounds really
simple but how many people can even do that for a week. This
is a rough estimation of course.
To put things into perspective:
1 mcdonalds upsize meal is about 1,300 calories
1 starbucks green tea ice frappucino is about 500
calories
1 slice of cheesecake is 250 calories
1 small glass(250ml) of marigold no sugar added orange juice is
93 calories
It all adds up very quickly.
And the average amount of calories burnt during a 5km run?
320 calories.
So I can run 5km everyday without a break and still get
fat if I eat too much.