Excessive consumption of broccoli can negatively impact your health, particularly your thyroid and digestive system.
Indian nutritionist Anshika Srivastava highlights the drawbacks of eating too much broccoli, including:
May Affect Thyroid Function
Broccoli, being goitrogenic in nature, can inhibit the functioning of the thyroid gland. This vegetable contains chemicals that prevent the absorption of iodine by the thyroid, causing it to enlarge and leading to goiter.
A study published in Cancer Causes Control confirmed this effect.
Srivastava states: “Broccoli also contains thiocyanates. This compound is dangerous as it leads to hyperthyroidism, resulting in issues such as weight gain, fatigue, hair loss, and facial edema.”
Potential Stomach Issues
Overconsumption of broccoli can also result in stomach problems. Belonging to the cruciferous family, similar to kale and cabbage, broccoli can cause stomach discomfort and bloating in some individuals.
The National Institute of Diabetes, Digestive and Kidney Diseases also lists broccoli as one of the gas-producing cruciferous vegetables.

Broccoli soup, packed with amazing health benefits.
May Cause Intestinal Irritation
Excessive broccoli intake can also lead to intestinal motility issues. While this vegetable is rich in fiber and beneficial in moderate amounts, Shrivastava explains: “Consuming too much fiber can result in intestinal irritation as your body may not produce sufficient enzymes to digest it effectively.”
Increased Risk of Ischemic Stroke
Broccoli also carries other side effects. If not properly cooked, it can increase the levels of isoflavones, thereby elevating the risk of ischemic stroke, especially in women.
Potential Drug Interactions
According to the Wexner Medical Center at Ohio State University, individuals taking blood-thinning medications should monitor their broccoli intake.
Research indicates that broccoli contains vitamin K, which may interfere with the effectiveness of these drugs.
How Much Broccoli Should You Eat Daily?
Experts recommend limiting broccoli consumption to one or two cooked cups per day.
The best way to prepare broccoli is by steaming it. The high fiber content in broccoli can make it difficult to digest when consumed raw.
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