A large meta-analysis of mortality studies in eating disorders found a weighted annual mortality rate for anorexia nervosa of 5 per 1000 person years. Studies in other psychiatric disorders have found rates of 2.5-2.8 per 1000 in schizophrenia, 1.9-2.1 per 1000 in bipolar disorder, and 1.5-1.6 per 1000 in major depressive disorder. Risk factors for mortality in anorexia nervosa include older age, alcohol misuse, and low BMI at presentation; 20% of these patients may die of suicide with the other deaths due to medical causes.

Publication reference : Arcelus J et al. Mortality rates in patients with anorexia nervosa and other eating disorders. A meta-analysis of 36 studies. Arch Gen Psychiatry 2011; 68: 724-31
Reference URL: https://pubmed.ncbi.nlm.nih.gov/21727255/