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The ‘New Tobacco’? Study Warns against Early Sugar Exposure to Protect Children’s Health

Conducted by teams from the University of Southern California, McGill University, and UC Berkeley, the study found that children exposed to low-sugar diets in their earliest days had a significantly lower risk of chronic diseases like Type 2 diabetes and hypertension later in life.

• By Pooja Chaturvedi Sah
• New Delhi
• Nov 05, 2024

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In a landmark study, researchers have revealed that sugar intake during the first years of life—starting from conception through the toddler years—could be a major factor in long-term health. Conducted by teams from the University of Southern California, McGill University, and UC Berkeley, the study found that children exposed to low-sugar diets in their earliest days had a significantly lower risk of chronic diseases like Type 2 diabetes and hypertension later in life. 

These findings support global recommendations to reduce sugar in baby foods and align with the World Health Organization’s (WHO) dietary guidelines, which suggest avoiding added sugars for children under two. The research underscores that early-life dietary decisions can have a profound impact on lifelong health. 

Sugar Restrictions from Conception to Toddlerhood: What the Study Shows 

Published in Science, the study focuses on the effects of limiting sugar intake during the first 1,000 days from conception. This period, encompassing pregnancy and the early postnatal years, is viewed as a critical window for developing long-term health resilience. 

Using data from the UK Biobank, researchers examined health outcomes for over 60,000 individuals born between 1951 and 1956. They compared adults conceived before and after Britain’s World War II-era sugar rationing ended in 1953. The findings were clear: adults exposed to sugar restrictions early in life showed up to a 35% lower risk of developing Type 2 diabetes and a 20% lower risk of hypertension. Furthermore, disease onset was delayed by several years, with diabetes onset delayed by an average of four years and hypertension by two years. 

Leveraging a “Natural Experiment” in Sugar Rationing 

Lead researcher Tadeja Gracner from the University of Southern California describes the study’s methodology as a unique opportunity. She explains, “It’s difficult to study the long-term effects of added sugar on health because it’s hard to track people’s exposure to specific diets over 50 to 60 years. The post-war rationing period gave us a natural experiment where people had very different early-life exposures to sugar.” 

During the rationing period, sugar intake was cut in half, with average daily consumption at around 40 grams. After rationing ended, consumption doubled to 80 grams per day. This stark contrast created a rare opportunity to observe the health impacts of different sugar exposures over a lifetime. 

The study’s findings were significant even for those who experienced sugar restrictions only during pregnancy, indicating that gestational sugar intake alone could substantially impact a child’s future health. However, prolonged sugar restriction after birth yielded even greater health benefits. 

A Contemporary Look at Sugar in Children’s Diets 

In recent years, there has been mounting concern about sugar in children’s diets, especially in baby foods marketed to low- and middle-income countries. A 2023 investigation by Public Eye and the International Baby Food Action Network (IBFAN) exposed a discrepancy in products marketed by food giant Nestlé. The investigation revealed that while the company’s baby foods contain added sugar in markets like India, they are free from added sugars in wealthier countries. In India alone, sales of Nestlé’s Cerelac—a popular baby cereal—exceeded $250 million in 2022, with each serving containing nearly three grams of added sugar. 

Nestlé has defended itself by pointing to recent reductions in added sugars for these products by up to 30% over the past five years. However, experts argue that more can be done to reformulate these products for all markets, as high sugar intake early in life is linked to a heightened risk of chronic diseases. 

In response to these concerns, India’s National Institute of Nutrition (NIN) revised its dietary guidelines in 2023 to advise against sugar for children under two and limit added sugar intake to 5% of daily calories for older children. 

Rethinking Sugar: Global Guidelines and Recommendations 

The WHO’s 2015 guidelines encourage adults and children to limit free sugar intake to less than 10% of their daily calories, with a further reduction to 5% recommended for added health benefits. For children under two, the WHO advocates for zero added sugars. These guidelines are based on strong evidence that excessive sugar consumption can lead to obesity, dental issues, and an increased risk of cardiovascular disease. 

The American Heart Association similarly recommends no more than 25 grams of added sugar daily for women and 38 grams for men. Yet despite such recommendations, high sugar consumption remains prevalent, particularly in processed foods. 

In India, 56.4% of the disease burden is attributed to poor diet, according to the Indian Council of Medical Research (ICMR). A 2022 study by the ICMR, in collaboration with the Madras Diabetes Research Foundation, found that one in four Indians is diabetic, prediabetic, or obese—conditions heavily influenced by dietary habits. 

The Impact of Sugar on Children’s Health: A Scientific Overview 

Researchers have long observed that added sugar consumption contributes to several health issues in children, including cardiovascular problems, obesity, insulin resistance, and nonalcoholic fatty liver disease. A 2021 study by the American Heart Association found that even low levels of added sugar could negatively impact blood pressure, lipid profiles, and insulin sensitivity in children. 

Recent research in animal models further supports these findings. A study led by the University of Georgia, in collaboration with the University of Southern California, found that high sugar intake during adolescence impaired learning and memory performance in rodents. Notably, changes in gut bacteria were linked to these memory deficits, suggesting a complex relationship between sugar, gut health, and cognitive function. 

The cumulative evidence suggests that added sugars should be limited as part of a healthy diet, particularly for children. According to the American Heart Association, children should consume no more than 25 grams (or six teaspoons) of added sugar per day. 

Comparing Sugar to Tobacco: A Call for Action 

Co-author Paul Gertler of UC Berkeley makes a compelling comparison: “Sugar early in life is the new tobacco. We should hold food companies accountable for reformulating baby foods to offer healthier options and consider regulating sugary foods targeted at children.” 

The analogy between sugar and tobacco emphasizes the urgency of addressing high sugar consumption from a public health perspective. Health authorities advocate for government intervention to limit added sugars in children’s foods, from imposing taxes on sugary products to tightening advertising regulations. 

Policy Implications and the Path Forward 

In response to the growing body of research, several countries have enacted policies aimed at reducing sugar intake. The UK introduced a tax on sugar-sweetened beverages in 2018, resulting in a significant drop in sugar consumption from soft drinks. In Latin America, countries such as Chile and Mexico have implemented strict labeling laws and advertising restrictions to protect children from excessive sugar intake. 

In India, however, there is still progress to be made. The Food Safety and Standards Authority of India (FSSAI) permits up to 20% added sugars in baby food products, sparking concerns about the long-term health impacts of these policies on children. Nevertheless, the recent updates from the ICMR-NIN could be a stepping stone toward stricter regulations on sugar content in foods, particularly those targeted at children. 

Conclusion: A Public Health Imperative 

The recent findings underscore the importance of re-evaluating early-life nutrition and its long-term effects on health. Reducing added sugar in children’s diets is not just about preventing obesity; it’s about setting a foundation for healthier lives free from chronic diseases like diabetes and hypertension. 

As evidence continues to accumulate, global health organizations and governments may face increasing pressure to introduce policies that protect future generations from the hidden dangers of sugar.