Losing 12 pounds in 3 days is incredibly fast and is not considered safe or sustainable by most experts. This type of weight loss is not caused by fat loss and can lead to dehydration, electrolyte imbalances, and other health risks.
Regardless of whether you’re interested in popular “fat burning” drinks, here’s one that’s often said to promote water loss and metabolism:
  Recipe for a fat-burning detox drink (some say it helps with water loss)
Composition:
1 cup of warm water (about 250 ml)
1 tablespoon raw apple cider vinegar (with nutmeg)
1 tablespoon lemon juice
1/2 teaspoon ground cinnamon
Pinch of cayenne pepper (optional, increases thermogenesis)
1 teaspoon raw honey (to taste, optional)