I get your skepticism. The food was prepackaged meals. On most you just added water and microwave it. I was allowed a limited amount of ketchup on the faux burgers. I ate absolutely nothing else.
I only very rarely drink alcohol. I do not drink sodas. I drink a cup of coffee with a little low fat milk and Splenda. Once in a while I drink sugar free iced tea. I drink a lot of water.
My wife and I run our company together, so we are together 24/7. She is normal sized, 5' 2" and about 120 pounds, and eats more than I do, by far. She helped monitor what I ate and accompanied me to my doctors appointments.
Trust me, it is VERY frustrating when you hear "I gave up beer and lost 50 pounds!" or "I stopped drinking Cokes and lost 25 pounds!" There is nothing in my diet like that. Instead, I get to go "I went on a three day fast and lost a pound!" My cardiologist didn't believe me either. He put a monitor on me for two weeks. He apologized after getting the results. My heart rate often drops to 30 BPM while sleeping. It is usually in the low to mid 40's during the day. Freaked him out.
Okay, in your case, it does make sense that you would burn far fewer calories than the average person if your heart is operating at half the rate of the average person.
Not to sound like a jerk, but you have to learn to ignore comments like my original reply. You appear to have an exceedingly rare legitimate medical condition such that normal calorie math doesn’t apply to you. Obviously you can’t fake a borderline dangerously low heart rate, but BS excuses related to laziness and lack of discipline for why someone needs pharmaceuticals are a dime a dozen. These people still need to have the truth told to them as often as possible.