My sister was diagnosed with bulimia earlier in her life and now seems to have relapsed into an eating disorder in response to stressful life events. She is very secretive, so I have not been able to determine how her eating disorder actually works, and I am perplexed and distressed. She seems to graze constantly and compulsively throughout the day. She almost always has some little crumb of food in her hand and often hoards food in her pockets. Meanwhile, she has a significant amount of weight. I'm trying to understand how this is possible. I understand the concept of bulimia, with large binges and purges. But how does someone purge when they're eating small amounts constantly? It seems unlikely that she is vomiting up a tablespoon of food every few minutes. She eats normal amounts at meals, and I am also certain that she is not controlling her weight through exercise. What technique could she be using to lose weight while eating virtually all the time? Thanks for your help.