> A sedentary lifestyle with minimal exercise has become the norm. The people being studied were in their 20s- obesity has increased 4-5x among children since

> A sedentary lifestyle with minimal exercise has become the norm. The people being studied were in their 20s- obesity has increased 4-5x among children since 1980, but it's still only 20-25% for people in their 20s. Since then we've gotten gym class and advil- they had barely gotten aspirin. Selection bias probably plays a very large part. They may have been able to measure temperatures but I doubt they were rigorous about taking representative cross-sections in 1910. Additionally the bias towards obesity has roughly switched- wealthier people were more likely to be obese in the 1900s, and now poorer people are more likely to be obese. That said, muscle mass correlates almost directly with energy consumption. Muscles literally require energy to stay limp. Rigor mortis is caused by the supply of energy being cut off. The majority of the body's energy requirement is spent just keeping your muscles in working order- not even moving.