There are a number of factors that could contribute to very religious Americans’ healthier lifestyle choices. Some of these factors are likely overt products of religious doctrine itself, including rules related to smoking and substance abuse. Seventh-Day Adventists, for example, strictly adhere to vegetarian lifestyles free of alcohol and smoking, while orthodox Mormons and Muslims do not drink alcohol. In some Christian denominations, gluttony and sloth are considered two of the seven deadly sins, and many evangelical faiths frown on drinking and smoking. The Bible indicates that one’s body is the “temple of God,” which could in turn help explain the relationship between religious orthodoxy and exercise and certain types of food consumption.

It is possible, of course, that the noted relationship between health and religiosity could go in the other direction — that people who are healthier are the most likely to make the decision to be religious. This could be particularly relevant in terms of church attendance, one of the constituent components of Gallup’s definition of religiousness. Healthier people may be more likely and able to attend religious services than those who are less healthy.