04/21/2026
The line has been crossed. More than half of adults alive today are now classified as overweight or obese, and the WHO's 2026 data makes it official.
In 2022, the WHO recorded 2.5 billion adults as overweight, with 890 million of those living with obesity. Combined, that pushes the global figure past 50% of the adult population for the first time in documented human history.
In 1975, only 105 million people globally were living with obesity. By 2022 that had grown to 890 million. A 2026 analysis published in the International Journal of Pharmaceutical Sciences projects that number will reach 1.13 billion obese adults by 2030.
But then something else is happening alongside those numbers. The food system is accelerating the problem in ways that are only now being fully documented. Ultra-processed foods account for over 50% of calorie intake in high-income nations, according to research published by the National Institutes of Health. A systematic review published in PLOS One in April 2026 by Mekuriaw Nibret Aweke of the University of Gondar found that adolescents consuming high levels of ultra-processed foods had more than double the odds of being overweight or obese compared to those who consumed less.
The UK sits in a particularly exposed position. Rates of overweight and obesity in the UK have risen 92% since 1990, compared to 65% in the United States, according to the OECD. The Organisation for Economic Cooperation and Development has identified the UK as the most overweight country in Western Europe.
The WHO issued its first formal guideline on GLP-1 therapies in December 2025, recommending drugs like semaglutide for long-term use alongside structured behavioural therapy. Research from Johns Hopkins Bloomberg School of Public Health, published in JAMA Internal Medicine in March 2026, found GLP-1 drugs delivered comparable effectiveness across age groups, races, and starting weights.
But IQVIA's 2026 obesity outlook noted that GLP-1 drugs were added to the WHO Essential Medicines List for diabetes only, not obesity, highlighting ongoing access and equity gaps that mean the treatment revolution is not reaching everyone equally.
The 50% threshold is not just a statistic. It marks the first moment in history when the minority of adults maintaining a healthy weight are outnumbered.