1200 is way too low for an adult, deficit or not. Going that low for a long stretch risks muscle and bone loss, plus foggy thinking, mood swings, and fatigue. I get wanting fast results, but slower loss, around a pound to a pound and a half weekly, tends to stick better long term. Start by calculating your maintenance burn, then build your target off that. Mine sat around 1900-2000 when I began, so I aimed roughly 200 below it and adjusted down as weight came off. Started in April and im about 40 pounds lighter since then. I still go out, still eat meals out, just pick lighter options, and the medication basically just meant the urge to snack disappeared. Thats the actual point of it, not starving yourself, just making room to build better habits.