The Claim

Higher consumption of ultra-processed foods, defined as exceeding 20% of daily energy intake, is associated with a 31% increased risk of developing autoimmune-related hypothyroidism over an average follow-up of 11.2 years in adults aged 40–69, after adjustment for demographic, lifestyle, and dietary confounders.

Source: Ultra-processed food consumption and incident autoimmune-related hypothyroidism: A sex-stratified prospective analysis from the UK Biobank.

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
67score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Correlation
1 study reviewed
In plain English

Adults aged 40–69 who consume more than 20% of their daily calories from ultra-processed foods have a 31% higher rate of autoimmune-related hypothyroidism over 11.2 years compared to those who consume less, even after accounting for other lifestyle and dietary factors.

See the scientific wording

Higher consumption of ultra-processed foods, defined as exceeding 20% of daily energy intake, is associated with a 31% increased risk of developing autoimmune-related hypothyroidism over an average of 11.2 years in a population of 123,812 adults aged 40–69, independent of demographic, lifestyle, and dietary confounders, suggesting a potential role for dietary quality in autoimmune thyroid disease risk.

Why this might work

Eating a lot of ultra-processed foods increases harmful fats, sugars, and additives in the body, which damages the kidneys and disrupts cholesterol transport. This causes toxins and inflammatory molecules to build up, activating immune cells that mistake the thyroid for a threat and attack it, leading to permanent loss of thyroid hormone production.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: Ultra-processed food consumption and incident autoimmune-related hypothyroidism: A sex-stratified prospective analysis from the UK Biobank.

    People who ate a lot of packaged and processed foods like chips and sugary drinks were more likely to develop an autoimmune thyroid problem over time, even when accounting for other healthy or unhealthy habits. This suggests what you eat might influence your thyroid health.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.