喝咖啡能护肝？是真的，喝越多效果越好，但医生也发出提醒

Brief (coffeeyo.com): A long-running study following more than 350,000 people links regular coffee consumption with a lower risk of cirrhosis, liver cancer and liver-related death — but doctors caution that sugar-free, moderate intake is the point, and coffee is no substitute for treatment.

Coffee has become the daily “wake-up” drink that city dwellers can hardly do without, but the claim that it protects the liver is one many people doubt. The answer, it turns out, is yes. A recent study covering more than 350,000 people over several decades of follow-up found that one to two cups a day were associated with a 20 percent lower risk of cirrhosis, a 24 percent lower risk of liver cancer and a 31 percent lower risk of death from liver disease. At five or more cups a day, the corresponding reductions were 32 percent, 47 percent and 42 percent.

Put simply: the more people drank, the lower their risk of liver disease. And this protective association held regardless of genetic predisposition to fatty liver or drinking habits.

How does coffee protect the liver? It works mainly on two levels. First, it reinforces the defences, strengthening the liver’s detoxification and metabolic functions so liver cells become more robust. Second, it suppresses inflammation. The key to chronic liver disease is the progression chain of “inflammation → fibrosis → cirrhosis → liver cancer”; the antioxidant compounds in coffee can effectively inhibit inflammation and slow fibrosis. In short, coffee repairs liver cells on one side while blocking the damage pathway on the other.

So what is the best way to drink it for liver health? The first choice is unsweetened plain black coffee — americano, pour-over or cold brew. Second best is a latte with a little milk and no sugar. Be aware that three-in-one instant coffee contains large amounts of non-dairy creamer (trans fats) and sugar, which can actually harm the liver. High-sugar coffee drinks such as caramel macchiatos and mochas exceed sensible sugar limits and aggravate fatty liver. Coffees loaded with whipped cream are high-fat, high-calorie bombs and are not recommended.

And how many cups? The finding above suggests more is better for liver risk, but the other risks of excessive intake have to be weighed too. For the general population, one to three cups a day (about 250 ml each) is a safe and effective range. Studies show greater benefit above five cups, but ordinary people need not force themselves to drink heavily: too much caffeine can easily cause palpitations, insomnia and stomach discomfort.

Timing matters. The suggested windows are 9–11 a.m. or 1–3 p.m. Do not drink it on an empty stomach, which stimulates gastric acid secretion, and avoid it in the evening, which disrupts sleep — and insufficient sleep itself harms the liver.

Who should be cautious?

• People with severe gastric ulcers or gastro-oesophageal reflux: caffeine may worsen symptoms.
• People with severe insomnia or anxiety disorders: avoid coffee after 2 p.m.
• People with decompensated cirrhosis, hepatic encephalopathy, fatty liver or chronic liver disease: regular, moderate intake is acceptable, but standard medical treatment must be followed as directed.
• Pregnant or breastfeeding women: no more than two cups a day.

One more essential reminder: coffee only plays a supporting, protective role and can never replace medical treatment. It cannot offset the liver damage caused by heavy drinking, so do not assume that coffee makes it safe to drink freely. If you want to use coffee to look after your liver, keep it sugar-free and moderate. Stay away from high-sugar speciality drinks, and combine that with avoiding alcohol, a balanced diet and adequate sleep to protect liver health on every front.

Author: clinical nutritionist, Department of Clinical Nutrition, Zhongshan Hospital affiliated with Fudan University.

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