We had people over for dinner last last and started discussing the book. One think led to another and we started talking about heart rates. Some of the "naturally thin" (eat anything and everything) people, had resting heart rates of anywhere from 70-85 beats per minute.

The people who seemed to battle their weight constantly had resting rates of anywhere from 50-70 beats per minute.

We then started talking about exercise rates and I started to tell them about when I exercise, in order to get my heart rate up even close to 160 beats per minutes I literally must run about 6.5 mph at 5% incline on a treadmill for about 30 minutes. My recovery is about 1 minute and I am back down to about 75 beats per minute. It has always been the same, whether I have been training or not. I have always fought with my weight as well and my resting rate is 60. I sometimes think I should be on a farm throwing hay bales 12 hours a day.

Does anybody know if there is information about heart rate and metabolism and is there a correlation to blood type?

Thanks.