I am struggling with this right now as well + trying to learn how to fuel properly for the increasing miles I am riding every week.
I just got the book "Nutrition for Cyclists" and am hoping this will help - am also prone to hypoglycemia and have diabetes 2 so all of this is an interesting learning curve.
I keep track of all of my food and exercise via "Lose It", an iPhone app and try to make sure I have at least a 500 calorie deficit on riding days. My HRM tells me the calories I've burned (though one wonders how accurate it is, at least it provides an indication). I've been operating at something like a 3,200 calorie deficit per week for months now, and my weight loss has slowed to a turtle's pace, perhaps slower.
My trainer has really been hitting hard with strength training so I can only assume that I am seeing the effects of increasing muscle.... I think that I need to start eating for endurance rather than solely weight loss...



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