Carrying onions can prevent heatstroke or lower body temperature is a myth, which may distract some from proven safety measures like hydration, shade, and rest.
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The belief that carrying onions prevents heatstroke has no scientific basis. While onions contain quercetin, antioxidants, and hydration-supporting minerals, they cannot shield the body from heat stress. Relying on myths may instill false security. Proven measures, hydration, shade, light clothing, and rest, remain the only effective ways to prevent heatstroke during scorching Indian summers.
Every summer in India the advice re-surfaces like clockwork, keep a raw onion in your pocket before going outside or consume one at lunch to stay safe from the heatwave.
Recently union minister, Jyotiraditya Scindia made headlines when he revealed that he avoids car AC and simply keeps a pocket onion instead. But how much of this has a biological footing and how much of it has its roots in lore?
While eating onions might have some mild, indirect benefits during summers carrying one in your pocket will do absolutely nothing.
The belief that keeping an onion in your clothes will absorb body heat or ward off sun stroke has absolutely no physiological grounding.
Skin is not a permeable membrane for vegetable compounds to pass through and there is no logical reason or scientific mechanism for an onion tucked away in your kurta to influence heart rate, body temperature or regulation of body heat.
Doctors confirmed that there is no proof or basis for carrying an onion to prevent heatstroke or keep body temperature down- and that continuing to believe it may instill a dangerous false sense of security leading to failure to take necessary protective measures. 1
This myth is believed to have originated from Ayurvedic and folk traditions in South Asia as onions are seen as 'cooling' foods, in the humoral theory. The confusion between conceptual 'cooling' and physical thermoregulation has been ongoing for generations.
This is where the subject is much more interesting and has some scientific backing, although it would not be correct to call onions a shield against heat stroke.
Onions (Allium cepa) are packed with quercetin - a flavonoid having anti-inflammatory and antioxidant properties. One extensive review found that the organosulfur compounds and quercetin in onions suppressed inflammation pathways.2
This is important because inflammation is a primary contributor to heat related organ damage.
The high water content of onions is also a contributing factor; roughly 89% water by weight and containing significant amounts of potassium and magnesium, which support fluid balance (critical during hot weather).
Dehydration is a primary pathway to heat exhaustion and thus foods supporting hydration would indeed be beneficial, albeit indirectly.
Food is certainly no replacement for basic protective measures. Consume copious amounts of fluids and electrolytes throughout the day, avoid direct sun during peak hours (11am to 4 pm), wear light colored, lose fitting cotton clothes and try and stay cool and seek shaded areas or air-conditioning. Heatstroke is the total failure of the body's heat-regulation mechanism, which cannot be easily averted by one vegetable alone.
Onions do have genuine beneficial qualities. They are nutritious and rich in quercetin, which offers real anti-inflammatory and antioxidant benefits as well as containing a good percentage of water and electrolytes beneficial to hydration during summers.
Eating them as part of a summer diet would undoubtedly be beneficial; just not to the degree of a shield against heatstroke.
The pocket onion, on the other hand, is pure myth and should be abandoned. With temperatures regularly exceeding 45°C during the summers in North India, relying on such mythologies may have severe consequences, so, eat onions and drink plenty of water.
Does keeping a raw onion in your pocket help prevent heat stroke?
No, carrying a raw onion in your pocket has no physiological effect on body temperature or heat stroke prevention. Skin does not absorb compounds from vegetables, and there is no scientific mechanism supporting this claim. Trusting this myth can lead to dangerous complacency during heatwaves.
Can eating onions reduce the risk of heat stroke?
Eating onions may offer mild, indirect benefits due to their high water content and quercetin levels, which have anti-inflammatory and antioxidant properties. However, there is no strong clinical evidence that onions prevent heat stroke or significantly lower body temperature.
How do onions contribute to hydration during hot weather?
Onions contain about 89% water by weight along with potassium and magnesium, which support fluid balance. These nutrients help maintain hydration, which is crucial in preventing heat exhaustion, but onions alone cannot replace proper hydration measures.
Are there scientific studies supporting onions’ benefits against heat-related damage?
Some animal studies indicate that quercetin, found in onions, reduces inflammation and oxidative damage related to heat stress. However, these studies used concentrated or injected forms of quercetin, so it's unclear if typical dietary onion consumption provides the same effects.
What are effective ways to prevent heat stroke during extreme heat?
Prevent heat stroke by drinking ample fluids and electrolytes, avoiding sun exposure during peak hours (11 AM to 4 PM), wearing loose, light-colored cotton clothes, seeking shade or air conditioning, and not relying on myths such as carrying pocket onions.
References
1. newsmeter.in |Fact Check: Carrying onion in pocket prevents heatstroke?
2. National Library of Medicine | A review of anti-inflammatory, antioxidant, and immunomodulatory effects of Allium cepa
Disclaimer: This content is for general informational purposes only and should not replace professional medical advice. Always consult a qualified healthcare provider with any questions about your health or treatment options.
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