I am male, 48, 6'2" and 230 lbs. I workout 4 to 5 days per week, doing a wide variety of sports (running, cross training, TRX, skiing, lifting weights etc). I was assessed last year and my cardiovascular health is top quartile for my age.
For years I have eaten a healthy diet averaging 2000 calories per day. According to the metabolic rate calculators, my average daily burn should be about 3400 calories per day. Therefore I have theoretically been running a deficit of 1400 calories per day for a very long time, yet my weight has been unchanged for years. This implies a very low basal metabolic rate.
My wife is much smaller than me and eats more. She says I am in starvation mode and my body wont give up my fat. That seems implausible as I am rarely hungry. Basically I eat til I am full. Regular meals, very little junk. She believes I need to eat more to rev up my body and lose weight but I feel that if I do that the opposite will occur. Plus I would have to gorge myself and feel uncomfortable.
I believe that the problem may be related to my very low heart rate. My resting heart rate is 42 bpm and has been at this low level for at least the last 25 years. Wen I exercise I can get it up to 160 but I quickly recover. The two factors that seem to be most able to affect bmr are heart rate and muscle mass.
Who is correct?