I see no reason to think that God would not want every one of his children to be healthy and live as long as they possibly could. You will not have a full measure of the spirit if your physical Tabernacle is unwell because of food choices and or activity decisions. Your body is a gift and it functions within its own realm and laws and boundaries that govern its operations. Learn to use that gift in its optimal boundaries and you will find you have a more complete measure of the spirit.