Today, chia seeds are a regular part of many people’s diets. They are added to smoothies, yogurt, and porridge and are associated with fiber, omega-3 fatty acids, and plant-based protein.
According to nutrition research, they are nutrient-dense but not without potential issues if consumed uncritically.
Reactions and acute risks
Although rare, chia seeds can cause allergic reactions. Verywell Health describes cases involving eczema, itching, and swelling of the face.
People with sesame allergies may be at increased risk and should be particularly cautious.
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A more concrete risk concerns how the seeds are consumed. Chia seeds can absorb large amounts of liquid and expand significantly.
According to the American College of Gastroenterology, cases have been reported in which dry seeds became lodged in the esophagus.
The risk can be reduced by soaking the seeds before use.
Effects on the body
Chia seeds contain large amounts of dietary fiber. This is beneficial for digestion, but high intake can cause bloating and abdominal pain, especially in people who are not accustomed to a fiber-rich diet.
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A study published in Nutrition, Metabolism & Cardiovascular Diseases shows that the high fiber content of chia seeds may reduce the absorption of minerals such as iron and calcium.
In addition, chia seeds may interact with medication.
Research published in Nutrition Reviews indicates that they may enhance the effects of diabetes medication and blood-thinning treatments if consumed in large quantities.
The key question
The crucial factor, however, is quantity. According to EFSA, chia seeds are safe for most people, but a standard serving already covers a large share of the daily fiber requirement.
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The National Kidney Foundation also recommends caution for people with kidney disease. Chia seeds are therefore healthy, but only when used in moderation.
Sources: Verywell Health, American College of Gastroenterology, Nutrition, Metabolism & Cardiovascular Diseases, Nutrition Reviews, EFSA og National Kidney Foundation.
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