I am so very sorry to hear about the loss of your friend at such a young age.
Genetics aside, this can happen often when people put more emphasis on the body exterior rather than their insides.
It does no good to work out like a fiend, have a great body, but live on nutritionaly deficient foods and processed garbage.
Compare your body to a car...you need gasoline, clean oil, clean transmission fluid, brake fluid, radiator fluids etc.
If you don't feed your car correctly and just spend your time polishing the exterior...how long do you think it will run?
Please, please, eat your darned fresh vegetables, fresh fruits, grains etc. every day and quit depending on a daily vitamin
and fast food meals.
Sorry for the rant