Hay Fever Medications May Increase Appetite and Weight Gain, Warns GP
Around one in four people in the United Kingdom suffers from hay fever, a seasonal allergy that disrupts daily life with symptoms like sneezing, itchy eyes, and blocked sinuses. While millions rely on over-the-counter or prescription antihistamines for relief, experts caution that these tablets might have an unexpected side effect. With parts of England experiencing high pollen counts this week, a general practitioner has disclosed that prolonged use of certain antihistamines could boost appetite, potentially resulting in gradual weight gain over time.
How Antihistamines Affect Appetite Regulation
Histamine actually helps suppress appetite in the brain, explains Dr Crystal Wyllie, a GP at ZAVA Online Doctor. When you take an antihistamine, you are blocking that effect, which may make you feel hungrier than usual. Over time, that can lead to increased calorie intake without you even realising it. Histamine is widely recognised as the chemical released during allergic reactions to triggers such as pollen, dust, or pet hair. However, it also plays a crucial role in regulating wakefulness and hunger. By interfering with this process, antihistamines may subtly alter how the body controls appetite.
Types of Antihistamines and Their Effects
There are two primary categories of antihistamines: older sedating versions like chlorphenamine, commonly sold under the brand name Piriton, and newer non-drowsy options such as acrivastine, often marketed as Benadryl Allergy Relief. Other popular non-drowsy alternatives include Piriteze, which contains cetirizine, and Clarityn, which uses loratadine. Nevertheless, even modern formulations might still influence appetite, while older types can cause drowsiness, reducing physical activity and further contributing to incremental weight gain.
Research Supporting the Link Between Antihistamines and Weight
Evidence suggests this connection is more than anecdotal. One observational study discovered that children taking antihistamines experienced an average increase of 1.17 points per year in their body mass index percentile, compared to a slight decrease in those not using the medication. Another study in 2020 found that individuals using prescription antihistamines tended to have higher body weight, BMI, and insulin levels than non-users. Experts stress that the relationship is complex. Weight and allergies appear to be linked in a two-way relationship, says Dr Wyllie. It is important to look at the bigger picture rather than blaming a single medication. They also emphasise that antihistamines remain a safe and effective treatment, with any weight changes likely to be modest and vary between individuals.
Holistic Approaches to Managing Hay Fever Symptoms
For those concerned about potential side effects, minor lifestyle adjustments, including dietary changes, may help manage symptoms more holistically. Food is not a replacement for medication, but certain nutrients can help your body respond more calmly to allergens, Dr Wyllie explains. Think of it as supporting your system from the inside out. Ingredients like ginger and turmeric are known for their anti-inflammatory properties, which could ease airway irritation. Citrus fruits, such as oranges and lemons, are rich in vitamin C, a natural antihistamine, while onions and apples contain quercetin, a plant compound believed to stabilise histamine-releasing cells.
Incorporating more oily fish like salmon and mackerel into your diet may also reduce inflammation due to their omega-3 fatty acid content. Some evidence, though not conclusive, indicates that consuming local honey might help the body build tolerance to pollen over time. Conversely, highly processed foods, excess sugar, and alcohol can increase inflammation, potentially worsening hay fever symptoms.
Conclusion: A Balanced Approach to Hay Fever Management
Experts assert that effectively managing hay fever often requires a combination of medication, lifestyle modifications, and dietary adjustments rather than relying on a single solution. While antihistamines can help control sneezing and other symptoms, being mindful of their broader effects, including appetite changes, could prevent unwanted weight gain. This comprehensive strategy ensures that individuals can enjoy relief from hay fever while maintaining overall health and well-being during pollen season.
