Never drink liquids during meals. It dilutes your digestive juices. And for sure!!! Never ever drink iced liquids during meals. Iced tea etc. will give you incomplete digestion, thus more fats deposited in you. Allow an hour or two before drinking.
Exceptions are a hot soup during cold weather and black coffee after a fatty meal such as bacon and eggs, or a meaty dinner.
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Ginger tea, hot, helps digestion after a big meal.