I will be 66 in October and get regular check ups with full blood panel. I have always been on the thin side and been cycling since my teens. The only health issue I have is hypothyroidism (stress related)so I take one pill a day and with regular check ups, I am good to go. A lot of it is genetics, we are what we are. We can tilt the scale by exercise and diet and with most of us it works. I have been a vegetarian for well over thirty years and five years ago became vegan. It works for me but I have heard it is not for everyone. My Dr. says my blood work up is like a twelve year old’s so I guess it is right for me , but I did a bit of research to get the right nutrients in my diet. For some , it isn’t worth the hassle but to me being able to jump on my bike and ride 45 miles it is totally worth it. Oh, and get rid of that nasty stress!