There is no reliable guarantee that vinegar water at bedtime causes weight loss by itself. Weight change is driven by total calorie balance and sustainable lifestyle habits. Also, bedtime vinegar can worsen reflux for some people because lying down makes acid symptoms easier to trigger. So a “before bed” routine is not ideal for everyone. If used, it should be low dose, well diluted, and should not cause nighttime burning or throat irritation. For weight goals, prioritize food structure and daily activity first.