Anorexia is complete restriction of food for long periods of time, which can cause symptoms of lack of nutrition such as nausea, dizziness, feeling weak, and more long term affects such as hair loss, weight loss, bruising and constant tiredness, and is easily recognized and diagnosed, although you don’t have to be underweight in order to be diagnosed. Bulimia on the other hand, is hard to catch, because they eat and act almost completely normal when it comes to food (may lightly restrict highly unhealthy foods) but will then proceed to either force themselves to throw it up or take laxatives in order to get it out of their system before it processes. This is so much harder to diagnose since patients behave so normally. Some early systems/ signs can be, excessing themselves to the restroom right after eating, constant tiredness, or constantly watching what they eat or excessively exercises.
hope this helped!! :)