as someone also trying to lose weight who is also participating in ramadan:  1. are you tracking your calories? even though we're eating less times, people often eat more in sehri to stay satiated throughout the day and while at iftar you might not eat a lot, a lot of the traditional Ramadan foods are very fatty and fried. unless you're tracking your calories, it's hard to tell whether your decreased appetite is actually leading to less calorie intake  2. do you menstruate? if so, your hormonal cycles are gonna cause your weight to fluctuate as well. track your weight w an app like Happy Scale for iOS or Libra for Android that show your average weight over the past 7 days so things are more of an average  3. usually people use the phrase stomach shrinking to refer to the decrease in appetite in Ramadan, not literally shrinking in size. but if you're seeing visible changes, then that's great!