The impact of climate change on our health and environment is vast, but less well-researched is the link between rising temperatures and changes in our eating habits. New research suggests that Warmer weather can lead to higher consumption of added sugar, which in turn increases the risk of obesity and other health complications.This trend is particularly pronounced among vulnerable and disadvantaged groups of the population.

As the temperature rises, so does the amount of sugar in the diet

A study that analyzed purchasing data from U.S. households from 2004 to 2019 found a direct relationship between temperature and added sugar intake. Added sugar consumption was found to be positively associated with temperature, particularly in the range from 12°C to 30°C, with an increase of 0.70 grams per degree Celsius. This increase is primarily driven by higher consumption of sweetened beverages and frozen desserts. While the impact was smaller in lower temperature ranges (0–20°C), a significant escalation in consumption occurred when temperatures exceeded 20°C, peaking in the range of 24–30°C. The positive effects persisted even above 30°C.

But why is this happening? It is likely related to the physiological and psychological need for fluids and chilled products in warmer weather, or perhaps to weather-based marketing strategies. Hot weather can increase the need for hydration, as higher metabolism leads to water loss. High temperatures often lead people to consume chilled drinks and frozen desserts. While food prices can affect consumption, physiological and psychological factors seem to be the main reason for the increasing sugar intake.

Vulnerable groups are most at risk

An important finding is that the extent of this impact is greater in households with lower incomes or lower levels of education. These groups show a stronger response to temperature changes, while households with higher education or higher incomes are less sensitive to weather changes. This may be due to less control over the temperature in the work or living environment, as well as limited food choices within a budget. Conversely, groups with higher socioeconomic status may choose healthier foods and beverages for health reasons and are less affected by product promotions in hot weather.

Projected consequences and health risks

Projections suggest a substantial national increase in added sugar consumption of 2.99 grams per day by 2095 (based on 5°C warming). The risk is even greater for vulnerable groups. For example, households with a male head with a college education could see an increase of up to 6.2 grams per person per day, while households with a female head without a high school education or with an income below $25,000 could see an increase of 3.5 and 4.9 grams per person per day, respectively.

Excessive consumption of added sugar already significantly increases the risk of obesity, various metabolic disorders, cardiovascular disease, cancer and other health complications.. In 2017-2018, individuals aged 2 and older in the U.S. consumed more than 70 grams of added sugar per day, well above the recommended dietary guidelines (less than 10 % daily calories from added sugar, equivalent to about 60 g on a 2,400-calorie diet). The American Heart Association recommends even lower limits—24 g for women and 36 g for men.

The need for targeted interventions

These findings highlight the urgent need to mitigate the health risks associated with excessive added sugar intake and to explore dietary adaptation strategies in the context of climate change. It is crucial to focus on addressing the nutrition and health inequalities that are exacerbated by climate change, identifying key populations for targeted interventions.

Potential policy measures include:

• Taxation of sweetened beverages (SSB): It has been shown to be effective in reducing shopping in some cities in the US and around the world.
• Nutrition education programs and warning labels on sweetened drinks.
• Supporting healthier elections: Proposals to modify food assistance programs (such as the Supplemental Nutrition Assistance Program) to encourage the purchase of healthier items.
• Product reformulation: As consumer health awareness increases, the industry can respond by reducing the sugar content of beverages.

Although this study Although focused on the US, its findings have broad applicability at the global level, including other developed countries and countries of the Global South, where the food landscape is changing and rising purchasing power is increasing the availability and affordability of added sugar. These findings underscore the urgent public health implications of climate-induced dietary changes, particularly for low socioeconomic groups and especially during warmer temperatures. JRi

The study was published in the journal Nature