Pu’er Coffee

 Morning—coffee aroma wakes up a new day. Afternoon—a cup of milk tea sweeps away the drowsiness. Late at night—energy drinks keep people going, whether they’re working overtime or gaming. In our fast-paced modern lives, there’s one substance often called the “gentlest stimulant”— caffeine . Without us noticing, it quietly shapes our daily rhythm. It’s the most widely consumed psychoactive substance in the world, with about 90% of adults taking it in one form or another. Caffeine can boost alertness, but it may also bring health risks. So how do we use this “double-edged sword” wisely? Let’s take a scientific look. What Exactly Is Caffeine? Caffeine is a natural alkaloid, chemically known as 1,3,7-trimethylxanthine , and it appears in over 60 plants including coffee beans, tea leaves, cocoa beans, and guarana berries. In nature, caffeine is a plant’s “secret weapon.” It can paralyze leaf-eating pests, protecting the plant, while its presence in nectar helps attract pollinator...

 Coffee can be an amazing pick-me-up — a source of energy when fatigue hits. But here’s the thing: it’s not for everyone. For some people, that comforting cup of black coffee may be quietly draining their health instead of boosting it. Let’s take a closer look — are you one of them? 1. Those with Sensitive Stomachs Have you ever felt stomach discomfort after drinking coffee? That’s because several compounds in coffee can irritate the digestive system. Both caffeine and chlorogenic acid stimulate stomach acid production, which can worsen acid reflux or heartburn. The effect is especially strong when you drink coffee on an empty stomach — a common habit for many people rushing out the door in the morning. Over time, this can damage the stomach lining and even trigger gastritis or make existing problems worse. If you often feel bloated, nauseous, or experience stomach pain after coffee, it may be time to cut back — or take a break from caffeine altogether. 2. People at High R...