Originally Posted by
Machka
It would be better than nothing, and would certainly be a great start, but 100 minutes would likely only burn 700-800 calories.
With that little exercise, a person would also have to make the decision to eat within their maintenance level for the most part, and the 700-800 calories might cover a once-a-week splurge.
First, I want to congratulate the OP. I think it is the little changes that can make a difference. You may also want to compare your bank statement. You've saved a lot of money with this one lifestyle choice.
I do not disagree with the actual calorie savings analysis you provided but I do think transporting by a motor vehicle encourages and ultimately leads to adding needless empty calories. The drive by food pick-up lanes seems to support this claim. So, time away from eating temptations which happens during bike commuting, also has a positive impact on calorie consumption.