People in the music business are not known for their healthy lifestyles, generally speaking. His health might have been less than optimal not because of excess weight or weight loss, but because of years of too much alcohol, drugs, junk food, lack of sleep, lack of exercise, etc.
“but because of years of too much alcohol, drugs, junk food, lack of sleep, lack of exercise, etc.”
My only knowledge of Meatloaf has been observational over the years, and can only speak to the observed obesity he had for so long, how physically grueling his concerts were on him and his self admitted life long battle with asthma. As to the other items you mentioned, I know not how or if they apply to Meatloaf personally.