If we have to be really, really thankful to one thing in life, it is our health. Health forms the basis for our happiness, clear thinking and material wealth. We cannot enjoy the beauty of sunrise if we get up with arthritic pain and cannot relish the sweetmeats if affected with diabetes. There is a common notion that "After 40 years of age anyway we will have to forgo sweets and rich food, so let's enjoy now."
Nothing is farther from the truth. This human body is made to enjoy everything in life till the last day, provided the body is not abused. Whoever takes care of the body by living in tune with nature, and do things in moderation during their youth will definitely enjoy till the last breath. We can't take health for granted, but have to work towards it each day.