That claim is misleading.
You can’t meaningfully lose body fat overnight just by drinking a mixture before bed. Real fat loss happens over time through a consistent calorie deficit (eating slightly fewer calories than your body uses), along with activity, sleep, and overall diet habits.
What can happen overnight is:
- Water weight changes (you may wake up slightly lighter or heavier depending on salt, carbs, hormones, and hydration)
- Reduced bloating if a drink helps digestion or acts mildly diuretic (like herbal tea)
- Temporary scale fluctuations, which are not fat loss
So if someone says “drink this and wake up slimmer,” it’s usually referring to water loss or digestion—not actual fat reduction. That “slimmer” effect disappears quickly once you eat or drink normally again.
If you want, tell me the exact mixture you saw and I can break down what it actually does (and whether it’s safe or useful at all).