"Healthy" is such an abstract concept that it's really not a useful metric, though. Even if we say "healthy" means a prevention of disease and/or a longer life

"Healthy" is such an abstract concept that it's really not a useful metric, though. Even if we say "healthy" means a prevention of disease and/or a longer lifespan, tea still needs the "in moderation" addendum. Fluorosis is common among people who drink large quantities of certain types of green tea, for example, and fruit juice could obviously contribute to diabetes. Having one alcoholic drink a night has a lot of measured benefit that disappears when you pass 2 drinks. In other words, "healthy" (as defined above) is not an attribute of just the substance but also the quantity and duration and a bunch of other important things. Which is why "_____ is good for you!" can be generally discarded as standalone advice.