While matcha is known for its health benefits, it's not suitable for everyone. The article outlines several groups who should be cautious or avoid it due to its high caffeine and vitamin K content.

Who Should Exercise Caution?
Individuals with Heart Conditions: The high caffeine content in matcha can increase heart rate and blood pressure, potentially causing palpitations in people with conditions like high blood pressure, arrhythmia, or coronary artery disease.

Those with Anxiety or Insomnia: Caffeine stimulates the central nervous system and can worsen symptoms of anxiety disorders and insomnia.

People Taking Blood Thinners: Matcha is rich in vitamin K, which can interfere with the effectiveness of anticoagulant medications like warfarin, raising the risk of blood clots.

Pregnant and Breastfeeding Women: Excessive caffeine during pregnancy is linked to a higher risk of miscarriage and low birth weight. Additionally, catechins in matcha may reduce the absorption of folic acid, an essential nutrient.

Individuals with Digestive Issues: Caffeine can stimulate stomach acid production, leading to nausea, acid reflux, and stomach pain in people with conditions such as gastritis or irritable bowel syndrome. Drinking matcha on an empty stomach is not recommended.

Children: The developing nervous systems of children are highly sensitive to caffeine. The article states that children under 12 should avoid caffeine, while those over 12 should limit their intake to less than 100 mg per day.

Additional Concerns
The tannins in matcha can also interfere with the absorption of non-heme iron from plant-based foods, which could lead to anemia if consumed frequently without proper dietary management.