A study reports:

Bodybuilders have a mortality rate 34% higher than that of the age-matched U.S. male population, according to a study presented at the American Urological Association’s 2016 annual meeting.

Daniel Gwartney, MD, and colleagues at Baylor College of Medicine in Houston identified 1,578 professional male bodybuilders who compete from 1948 to 2014. They were able to obtain complete mortality data for 597. The mean age of the cohort was 47.5 years (range 25–81.7 years). The mean age during competitive years was 24.6 years (range 18–47 years). Of the 597 men, 58 (9.7%) were reported dead. Only 40 deaths were expected in this population based on age-matched data, for a standardized mortality rate of 1.34…

Although the cause is unclear, the increased mortality supports the possibility that use of performance enhancing drugs and unique competitive training, such as extreme weight changes, may contribute to deaths among younger professional bodybuilders.

Another possibility is that body building increases body mass index (bmi) and bmi causes death, regardless of whether the weight is muscle or fat. One reason might be that it burdens the heart to pump blood through such a robust body.

Another reason is that weight/height ratio is negatively correlated with IQ so high BMI people might make bad health and safety decisions.

Another reason weight/height ratio may lower life span is that it requires that you eat a lot and a growing body of research suggesting fasting is the key to long life span.

Having tall gracile African physiques may have give our species a competitive advantage over the short robust cold adapted Neanderthals because although height and strength both confer benefits, the caloric cost of the latter is much greater making it an inferior strategy.