FYI, with regard to things like tea, coffee, mate, fruit juice, etc --- the principle I was taught in health class is that anything which requires more fluid for the body to process than it brings in with it doesn't count for hydration purposes. Also, diuretics don't count because they flush out fluid from your system.
So according to what i was taught, herbal tisanes which are not strong diuretics and don't contain caffeine (which is a diuretic) count. Tea, coffee, mate, juice, milk, highly sweetened beverages (ie soda), alcoholic beverages, and smoothies don't count as all of them either have diuretic properties (tea, coffee) or rquire more fluid to process than they bring in (juice, beer).
This was about 40 years ago, though, so understandings of how the body processes, say, milk or vegetable juices may have advanced and changed which categories the different beverages belong to. But the basic advice is still sound: if it flushes fluids (diuretics) or requires a lot of fluid for the body to process (alcohol), it doesn't count toward liquid requirements.
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So according to what i was taught, herbal tisanes which are not strong diuretics and don't contain caffeine (which is a diuretic) count. Tea, coffee, mate, juice, milk, highly sweetened beverages (ie soda), alcoholic beverages, and smoothies don't count as all of them either have diuretic properties (tea, coffee) or rquire more fluid to process than they bring in (juice, beer).
This was about 40 years ago, though, so understandings of how the body processes, say, milk or vegetable juices may have advanced and changed which categories the different beverages belong to. But the basic advice is still sound: if it flushes fluids (diuretics) or requires a lot of fluid for the body to process (alcohol), it doesn't count toward liquid requirements.