Because actual coffee can be good for you. And they tell themselves they're drinking coffee, even if only a hint of it is present with all the other beetus drink. Then, in their minds, they can say: "I can't do anything about my weight. I already eat healthily. HAES." They extend this to other things. Eating olive oil, avocados, nuts, etc. All things which can be healthy in small amounts but they eat to excess with the rest of their beetus. Another example: 2 giant whoppers, fries, dripping with cheese, ice cream, etc, but they have a Diet Coke because that's "healthy." I am a Diet Coke addict myself, but it doesn't cancel out unhealthy choices. Basically, fats are intellectually lazy and look for any mental shortcut to excuse their own personal dysfunctions and lack of willpower.