Although the study states that obese and non-obese cohorts were looked at separately, there was no break-out for individuals with normal or low BMI, when I would expect worse outcomes from weight loss.Non-intentional weight loss, especially for someone of healthy or low weight, is often a marker for a serious underlying condition which would increase the risk of death. Intentional weight loss may results in deficiencies in essential nutrients.
individuals who lost weight were in fact malnourished, nor whether adequate nutritional supplementation was practiced. A layperson who takes an interest in health matters would expect that an obese or overweight person who loses weight on a nutrient-dense diet would increase their longevity, and that conversely a person of healthy or low weight who lost weight through a method that caused malnourishment would shorten their life expectancy. Yet we are not shown evidence that either confirms or refutes these expectations.