26 Frequently Asked Questions About Tea: Everything You Should Know
If you have questions about tea, you're in the right place. This article answers 26 common questions about loose leaf tea, covering everything from caffeine to storage, health, and brewing. Written in plain language so you can find what you need without digging through walls of text.
Frequently Asked Questions About Tea
a. Can tea cause heartburn?
Tea contains a compound called theophylline that can relax the lower oesophageal sphincter and trigger acid reflux and heartburn in some people. We suggest drinking tea with food or after eating, rather than on an empty stomach, if you're sensitive to this.
b. Can tea expire?
As a food product, yes — tea can expire in the sense that quality degrades. But tea has a long shelf life. Properly stored black tea stays at peak quality for 2 years; green and white teas for 6–18 months. Tea stored in an airtight tin away from light and heat is safe to drink for years, even if the flavour has faded.
c. Can tea cause gas?
Tannins and catechins in tea can cause bloating in some people, particularly on an empty stomach or if you drink large quantities of strong tea. We suggest not drinking very strong teas when you haven't eaten.
d. Will tea stain my teeth?
The tannins in tea can contribute to teeth discolouration over a long period of time if you don't brush regularly. This is more common with dark, heavily tannic black teas. High-quality whole leaf teas, brewed correctly, contain fewer free tannins than over-steeped commodity blends.
e. Will tea steep in cold water?
Yes — cold brew tea is excellent. The key difference is time: cold brewing takes 8–12 hours to extract properly. We suggest steeping loose leaf tea in a pitcher in the refrigerator for 8–12 hours. Green and black teas cold brew faster than white teas. Cold brewing naturally produces a sweeter, less astringent cup.
f. Can tea go bad?
Tea can go bad if exposed to moisture, which causes mould. Dry, properly stored tea doesn't become unsafe — it just loses flavour over time. If your tea smells musty, has visible mould, or has been exposed to water, discard it. Otherwise, "expired" tea is just stale, not dangerous.
g. Is milk and sugar in tea bad?
Milk and sugar add calories to an otherwise zero-calorie drink. If you're managing calorie intake, yes — they add up. More practically, if you're adding them to mask bitterness, the better solution is switching to a higher-quality, naturally smoother tea that doesn't need additives. Nepal Hills' teas are specifically noted for no bitterness at any altitude from 5,000–7,000 ft.
h. What tea is good for digestion?
Peppermint tea is well-studied for easing stomach cramps and relaxing the digestive tract. Ginger tea stimulates digestive enzymes and alleviates nausea. These are herbal infusions (not Camellia sinensis teas) but are widely used for digestive comfort. Among true teas, black tea's theaflavins have prebiotic properties that support beneficial gut bacteria.
i. Which tea has the most caffeine?
Among black, green, white, and oolong teas, black teas generally have the most caffeine due to full oxidation and processing. However, this varies by cultivar and preparation. Some black teas processed with minimal fermentation — like Gold Black Tea from Nepal Hills — are lighter in caffeine than heavily oxidized blends. White tea, despite being minimally processed, often has lower caffeine because it's brewed at lower temperatures with shorter steeping times.
j. How is tea made?
Depending on the type, tea goes through different steps. Common steps include: withering (controlled dehydration of fresh leaves), rolling or shaping (physical manipulation that breaks leaf cells and initiates oxidation), oxidation or firing (controlled enzymatic change that defines tea type), and drying (which halts all enzymatic activity and fixes the flavour profile). Green tea skips oxidation; black tea fully oxidizes; oolong is partially oxidized.
k. Where is tea grown?
Tea originated in China and is now grown across the world in tropical and subtropical regions, except in Arctic and Antarctic climates. China and India are the largest producers. Nepal, though a small producer by volume, is recognised for exceptional quality — particularly from the high-altitude regions of Ilam and Taplejung at 5,000–7,000 ft.
l. Where does the best tea come from?
While personal preference varies, widely respected high-quality tea origins include the Darjeeling hills of India, Uji in Japan, Wuyi in China, and Ilam and Taplejung in Nepal. High-altitude, small-farm cultivation generally produces more complex, less bitter teas than large lowland estates. Nepal's mountain teas are increasingly recognised by tea professionals as among the finest in Asia.
m. Which tea is best for weight loss?
Green tea is the most studied for weight management, primarily due to EGCG catechins that modestly increase fat oxidation. White tea has a comparable catechin profile. However, the effect is incremental and not a substitute for diet and exercise. The most reliable weight-related benefit of tea is replacing sugary drinks with zero-calorie unsweetened loose leaf tea.
n. Will tea dehydrate you?
No. Tea is approximately 99% water, and while caffeine has a mild diuretic effect at high doses, the net effect of drinking tea is hydrating, not dehydrating. You would need to drink very large quantities of very strong tea before the caffeine diuretic effect outweighed the fluid intake. Regular consumption of 2–4 cups per day is net-positive for hydration.
o. Is tea more popular than coffee?
By volume, tea is the second most consumed beverage globally after water — more widely consumed than coffee in terms of cups drunk per day worldwide. Coffee is more popular in North America and much of Western Europe; tea dominates in Asia, the Middle East, and parts of Africa and Eastern Europe.
p. Will tea make you poop?
In some people, caffeine stimulates bowel movement — the same mechanism as coffee. Strong black tea can have a mild laxative-like effect, particularly on an empty stomach. For most people drinking moderate amounts of tea with food, this is not an issue.
q. Can tea bags be composted?
Many commercial tea bags contain microplastics in their mesh or sealing material and cannot be fully composted. Only tea bags made entirely of unbleached paper or biodegradable materials can be composted. Loose leaf tea — by definition — produces no plastic waste and the spent leaves are entirely compostable.
r. Can loose leaf tea be composted?
Yes. Spent loose leaf tea is organic matter and an excellent addition to compost or garden soil. The tannins and polyphenols in used tea leaves can also help deter pests when mixed directly into soil.
s. Does tea have caffeine?
Yes, all true teas (from the Camellia sinensis plant — black, green, white, and oolong) contain caffeine. The amount varies by type, processing, brew time, and water temperature. Black teas generally have the most; white teas steeped briefly have the least. Herbal teas (chamomile, peppermint, etc.) are not true teas and are naturally caffeine-free.
t. Can tea break a fast?
Unsweetened plain tea — no milk, no sugar, no additives — contains negligible calories and does not trigger an insulin response. Most people following intermittent fasting treat plain tea and water as permissible during fasting periods. Adding milk, honey, or sugar would break a strict fast.
u. Do tea bags contain plastic?
Yes — most commercial tea bags contain some form of plastic. Polypropylene is commonly used to heat-seal bags; some "silken" pyramid bags are made from nylon or PET plastic. These can leach microplastics into hot water. Loose leaf tea eliminates this issue entirely.
v. Does tea make you pee more?
Caffeine has a mild diuretic effect at high doses. For most moderate tea drinkers (2–4 cups per day), this is minimal and the net effect is hydrating. If you have an underlying urinary condition, caffeine in tea may aggravate symptoms — in which case switching to lower-caffeine teas (white tea or oolong) or reducing strength is advisable.
w. Does tea contain nicotine?
No. Tea does not contain nicotine. Camellia sinensis and tobacco are unrelated plants. The calm alertness associated with tea drinking comes from L-theanine and caffeine, not nicotine.
x. Does tea keep you awake?
High-caffeine teas (strong black tea) consumed in the evening can interfere with sleep for caffeine-sensitive people. However, the L-theanine in tea softens caffeine's stimulating effect compared to coffee. For evening use, lower-caffeine options like Floral White Tea or Fresh White Tea are good choices — enough to be enjoyable, gentle enough to drink before bed.
y. Is tea healthy?
Research consistently associates regular tea consumption with a range of positive health outcomes: reduced cardiovascular risk, lower markers of inflammation, improved gut microbiome diversity, and better metabolic health. These are associations from population studies, not guaranteed individual outcomes — but the evidence base is strong and consistent across multiple tea types.
z. Is tea hydrating?
Yes. Tea is approximately 99% water, and its mild caffeine content at typical drinking doses does not offset the fluid contribution. Studies confirm that moderate tea consumption counts toward daily fluid intake and contributes to hydration. This is one reason tea has been the world's second most consumed beverage for thousands of years.
Try Nepali Loose Leaf Tea — Answers in Every Sip
The Tea Sampler Kit ($30) includes 10 whole leaf teas from 4 farm partners in Ilam and Taplejung — the best introduction to why high-altitude Nepali tea is naturally smooth, flavourful, and enjoyable without additives.
Explore: Floral Green · Floral White · Muscatel Black · Floral Oolong · Gold Black Tea
Authored by:
Bhaskar Dahal
2nd Generation Tea Entrepreneur
Founder and CEO, Nepal Hills Tea Inc.