Oneder, good for your mother. Our class had a few dropouts but most stayed to the end. Intermittent fasting is a good thing in my book but there a bunch of different fasting techniques out there so you have to figure out which one you want to try. Then you have to not stuff food into your mouth for a while. Very tough. Kinda goes directly against the grain, the reason why you are big in the first place. I know this forum has an arbitrary weight of 200lbs or greater but it is possible to be obese at a much lighter weight. Overweight people of all sizes and weights can have greater mobility and flexibility issues so that even a person who is under 200 lbs but obese for their height and build might have very real fit issues with bicycles. However I agree that when you get to 275lbs and greater bicycle strength issues start cropping up. Taller people have a hard time getting proper fits, and if they are very heavy then it is a double negative whammy.