Does Adding Green Tea Powder to Yogurt or Milk Affect Calcium Absorption?

Is there any harm in mixing green tea powder with yogurt or milk?

Hello: I would like to ask if green tea powder contains caffeine.
If it is consumed with yogurt or milk, does it hinder calcium absorption? Thank you!

Lin, 20~29 year old female. Ask Date: 2002/06/17

Dr. Xie Huimin reply Nutrition

Green tea powder contains caffeine.
Excessive caffeine can affect calcium absorption.
If too much green tea powder is added to milk, it can impact calcium absorption.

Reply Date: 2002/06/17

More Info

Green tea powder does indeed contain caffeine, which can have various effects on the body, including potential impacts on calcium absorption. When considering the combination of green tea powder with yogurt or milk, it is essential to understand the nutritional dynamics at play.

Caffeine, found in green tea, can interfere with calcium absorption in the intestines. This is particularly relevant for individuals who consume high amounts of caffeine regularly. Studies suggest that excessive caffeine intake may lead to a decrease in calcium absorption and could potentially contribute to bone density loss over time. However, moderate consumption is generally considered safe for most individuals and does not significantly affect calcium levels.

When green tea powder is added to yogurt or milk, the interaction between the components can be complex. Milk is a rich source of calcium, and it contains proteins that can bind to certain compounds, potentially affecting their absorption. Some studies indicate that calcium from dairy products can bind with oxalates (found in various foods, including green tea) in the gastrointestinal tract, which may reduce the absorption of both calcium and oxalates. However, this binding process can also lead to the excretion of oxalates in the stool, thereby reducing the risk of oxalate-related kidney stones.

For individuals concerned about calcium absorption, it is important to consider the overall dietary context. If green tea powder is consumed in moderation alongside a balanced diet rich in calcium, the negative impact on calcium absorption may be minimal. Additionally, the presence of other nutrients in yogurt or milk, such as vitamin D, can enhance calcium absorption, potentially offsetting any inhibitory effects from caffeine or other compounds in green tea.

In terms of kidney stone risk, particularly for those with a history of calcium oxalate stones, it is advisable to monitor the intake of both calcium and oxalate-rich foods. While green tea does contain oxalates, the combination of calcium from dairy can help mitigate the risk of stone formation by promoting the excretion of oxalates through feces rather than urine.

For individuals who are undergoing treatments such as chemotherapy, as mentioned in previous discussions, it is crucial to consult with healthcare providers regarding dietary choices. Some patients may experience gastrointestinal side effects that could be exacerbated by caffeine or other stimulants found in tea. In such cases, it may be advisable to limit or avoid green tea altogether.

In conclusion, while adding green tea powder to yogurt or milk may have some impact on calcium absorption due to the presence of caffeine and other compounds, the overall effect is likely to be minimal for most individuals when consumed in moderation. It is essential to maintain a balanced diet and consult with healthcare professionals, especially for those with specific health concerns or dietary restrictions.

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