3 best teas for lowering blood pressure, sugar and cholesterol, nutritionist reveals

Many people drink tea to refresh themselves, but the benefits of tea for the body are actually greater than imagined. A nutritionist recommends three types of tea that can be consumed in moderation daily, which not only help reduce the 'three highs' – high blood pressure, high blood sugar, high cholesterol – but also protect cardiovascular health and aid weight loss. So, how should you drink them to maximize their effects?

Nutritionist Sit Hiu-ching stated on her Facebook fan page that from antioxidant effects and lowering blood lipids to protecting the heart and weight loss, different types of tea harbor unexpectedly powerful strengths. In recent years, numerous medical journals have confirmed the remarkable health potential of green tea, matcha, and black tea.

According to a 2021 meta-analysis published in Antioxidants, green tea significantly enhances the total antioxidant capacity of the blood, effectively reducing free radical damage to cells. Simultaneously, it helps lower the body's inflammatory response. 

A 2019 study published in Complementary Therapies in Medicine indicated that type 2 diabetic patients who drank green tea daily could reduce their C-reactive protein (CRP) by approximately 5.5 mg/L, meaning chronic inflammation was significantly improved. In other words, a cup of green tea not only relieves stress but also upgrades your antioxidant system, keeping blood vessels young and vibrant. Sit pointed out that green tea, matcha, and black tea are health representatives among teas because they are rich in three major health components:

• Tea Polyphenols: Include catechins, theaflavins, and thearubigins. They are the main force for scavenging free radicals, reducing chronic inflammation, and delaying cell aging.
• Caffeine + L-Theanine: This combination magically enhances your focus and alertness while promoting fat metabolism, achieving a natural balance of refreshment without anxiety.
• Dietary Fiber: Especially matcha, which provides natural fiber, promotes the production of short-chain fatty acids, and effectively strengthens the intestinal barrier, boosting your gut health.

Nutritional Value and Effects of Green Tea, Matcha, Black Tea

Sit stated that green tea and matcha are particularly outstanding in antioxidant activity and metabolic regulation, while black tea demonstrates its unique and excellent value in vascular and intestinal health. Below is the nutritional value of green tea, matcha, and black tea:

Green Tea – Clears Blood Lipids, Stabilizes Blood Sugar

Its core health component is catechins (EGCG), a potent natural antioxidant molecule. A 2023 meta-analysis in Frontiers in Nutrition showed that green tea supplementation effectively lowers fasting blood glucose, glycated hemoglobin (HbA1c), and bad cholesterol (LDL-C), while increasing good cholesterol (HDL-C). This indicates that green tea has the effects of clearing blood lipids and stabilizing blood sugar, making it especially suitable for people with metabolic syndrome.

Matcha – Antioxidant, Improves Immunity

Its efficacy surpasses that of green tea. It is made by grinding the entire green tea leaf into a powder, resulting in a much higher concentration of tea polyphenols compared to regular green tea. According to a 2023 randomized double-blind trial in the Journal of Clinical Biochemistry and Nutrition, daily consumption of matcha significantly increased the abundance of the gut probiotic Coprococcus and reduced the potentially pathogenic bacterium Fusobacterium after two weeks. Matcha not only provides antioxidants but also nurtures good bacteria, helping to stabilize the gut environment and indirectly improving immunity and mood.

Black Tea – Anti-Obesity, Protects Heart Vessels

A 2014 clinical trial in Food & Function found that subjects who drank three cups of black tea daily for three months saw an average reduction in waist circumference of 1.9 cm and a weight loss of about 0.6 kg. The research team discovered that the polyphenols in black tea effectively regulate fat metabolism and improve vascular endothelial function, making it a dual-efficacy tea for anti-obesity and heart protection. Although theaflavins and thearubigins in black tea are larger in chemical structure than green tea catechins, they exert long-lasting antioxidant and anti-inflammatory effects in the gut.

4 Recommended Golden Times to Drink Tea Daily

Sit stated that to truly harness the health benefits of tea, both the method and timing of consumption are crucial. She proposes a simple tea guide:

• Breakfast: Start the day's metabolism with a cup of fresh green tea. To promote mental alertness, pair it with a whole grain breakfast or oatmeal.
• After Lunch: Enjoy a cup of matcha latte. Besides powerful antioxidants, it supplements fiber, helping to stabilize post-meal blood sugar and lipids.
• Afternoon Tea: Choose black tea paired with nuts to replace sugary drinks. This not only satisfies cravings but also stabilizes energy levels and keeps your mood pleasant.
• After Dinner: Have a cup of cold-brewed green tea. The low-caffeine version helps cut grease and aids digestion, effortlessly maintaining bowel regularity without burden.

Using approximately 240mL per cup as a reference, Sit pointed out that green tea and matcha have a higher proportion of L-theanine, which effectively relaxes nerves and mitigates heart palpitations. Therefore, the refreshment from drinking green tea or matcha is typically alert but not tense.

• Green Tea: Caffeine content is about 20–45 mg, placing it at a medium level. It's worth noting that the caffeine in green tea is balanced by L-theanine, resulting in a clear, focused alertness that is less likely to cause anxiety or palpitations. This is why many people choose green tea in the morning—it wakes up the mind without overstimulating the nerves.
• Matcha: Caffeine content is about 60–80 mg, relatively the highest among the three teas. Because matcha involves consuming the entire ground tea leaf, the ingested caffeine amount is much higher than typical brewed tea. Matcha provides quick refreshment and significantly enhances focus, making it very suitable before morning work or exams. However, if you are sensitive to caffeine, it's advised to avoid consuming it on an empty stomach or in the afternoon.
• Black Tea: Caffeine content is about 40–70 mg, slightly higher than green tea but still significantly lower than a standard cup of coffee (about 95–120 mg). Black tea, having undergone complete fermentation, offers a rich tea aroma and a gentle stimulating effect. It effectively helps boost metabolism and uplift mood, making it an ideal coffee substitute in the afternoon.

Sit reminds us that all values can vary significantly depending on the tea variety, cultivation method, brewing time, water temperature, and quantity. If you have sleep issues like difficulty falling asleep, light sleep, or are prone to anxiety, it is strongly recommended to avoid any tea beverages (including green tea, matcha, and black tea) after lunch. Because the half-life of caffeine is about six to eight hours, drinking tea in the afternoon can still cause stimulating effects at night, thereby affecting sleep quality and deep rest.