Water, coffee, tea, infusions and other drinks: composition, preparation, storage and everyday consumption.
Classic boba pearls are small balls made mainly from tapioca starch, which comes from cassava. When boiled, the starch gelatinizes into a translucent, elastic, chewy structure. The cooked pearls are commonly sweetened and added to milk tea, fruit tea, or other drinks.
A dirty matcha is essentially a matcha latte with coffee added, usually one or two shots of espresso. It combines matcha's grassy, umami profile with roasted coffee notes. Because it contains both drinks, it also combines their caffeine contributions.
Hojicha is Japanese green tea that is roasted after initial processing. Heat transforms its profile: it loses much of the vivid grassy character associated with matcha and develops roasted aromas reminiscent of nuts, caramel, and wood. It is commonly brewed with hotter water and is also popular in lattes and desserts.
A simple matcha bowl can start with about 1.5–2 g powder and a small amount of water around 175°F/80°C. Sifting, dispersing the powder first, and whisking rapidly side to side creates a smoother suspension and fine foam without needing boiling water.
The effect is real for a subset of people: motility studies detect increased colon contractions within minutes after coffee. Because decaffeinated coffee can also trigger a response, caffeine is not the sole cause; neural and hormonal digestive signals appear to contribute.
Coffee bitterness comes from a mixture rather than one chemical. Caffeine joins roasting products and other bitter molecules, while brewing conditions determine their concentration in the cup.
Quinine supplies tonic water's signature bitterness. Human taste is highly sensitive to this alkaloid, so a relatively small concentration can remain obvious even in a sweetened drink.
In essence: a coffee bean is the seed of the coffee plant's fruit, not a botanical bean.
For a similar cup size, brewed coffee usually contains more caffeine than instant coffee, although the recipe can easily narrow or reverse the difference.
Caffeine can have a mild diuretic effect, especially at high doses, but the water in coffee normally outweighs that effect and the drink still contributes to hydration.
The FDA cites 400 mg per day as an amount not generally associated with negative effects for most adults, but individual sensitivity and serving size can change what is too much for you.
Plain sparkling water hydrates just like still water: carbon dioxide changes the bubbles and mouthfeel, not the ability of the water to supply fluid.