The average calorie expenditure of an adult woman is 2k only if you're active. Frappachinos/drinks at the green mermaid store top out at 600-700. Literal milkshakes are usually the only drinks I see that push over 1k.
@gum_rummy Yes indeed, but the key words there are "average" and "only if you're active" It's more like 1500 calories for an office worker or other sedentary woman. So if you eat three meals a day, they should be about 500 calories each to maintain weight. They say 3,500 calories equals about 1 pound of fat so a mermaid drink a day in addition to your regular meals means you'll gain a pound of fat every week. 2.2 pounds = 1 kg