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Effets consommation sucre psoriasis.

Does sugar consumption promote the onset of psoriasis?

Psoriasis, a chronic inflammatory skin disease, is characterized by thick red plaques covered with scales that appear on various parts of the body. While diet can play a crucial role in reducing psoriasis-related symptoms, it's important to note that certain foods tend to trigger it. Could sugar be one of them? This article provides the answer.

Published February 20, 2024, by Manon, Scientific Editor — 3 min read

Psoriasis, in brief.

The psoriasis is a skin disease that is recognized by the red and scaly patches that cover specific parts of the body. These can be a source of itching and irritation, their intensity varying from one individual to another. They appear following skin inflammation caused by a failure of the immune system. T lymphocytes produce inflammatory molecules (cytokines Il-17, Il-22, TNF-alpha, among others). These stimulate the proliferation of keratinocytes. The renewal period of these cells, normally three weeks, then becomes three days. As a result, there is an accumulation of immature keratinocytes on the skin surface, increasing the thickness of the outer layer (the cornea). This is referred to as hyperkeratosis.

Does sugar affect psoriasis?

The consumption of certain foods is discouraged, even prohibited in cases of psoriasis. These tend to create a pro-inflammatory state. Sugar is at the forefront.

A study conducted on rats affected by an induced form of psoriasis has shown that excessive consumption of simple sugars exacerbates the disease, particularly in terms of inflammation. Rats fed on fructose showed an increase in serum levels of IL-17 compared to control rats. They also exhibited an increase in epidermal thickness and an increase in the expression of neutrophil markers that contribute to inflammation. All of these factors led to a worsening of psoriasis.

Regarding the role of sugar in the onset of psoriasis, scientific research has not yet established a direct link between sugar consumption and the triggering of psoriasis. However, sugar intake can potentially influence the severity of symptoms in some individuals with psoriasis by increasing chronic inflammation. Sweets and all sugary products such as cakes or spreads should be consumed in moderation by individuals with psoriasis. Similarly, ice cream and jam are not recommended.


  • AFIFI L. & al. Dietary behaviors in psoriasis: Patient-reported outcomes from a U.S. National Survey. Dermatology and Therapy (2017).

  • KANDA N. & al. Nutrition and psoriasis. International Journal of Molecular Sciences (2020).


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