Less Sugar as a Baby, Fewer Heart Attacks as an Adult

Limiting sugar consumption in early childhood may reduce the risk of serious heart problems later in life. A study published in The BMJ, based on data from the period after sugar rationing was lifted in the UK in 1953, found that people who consumed less sugar in childhood were less likely to suffer from conditions such as heart attack, heart failure, and stroke as adults. The strongest protective effect—along with the greatest delay in the onset of heart disease—was observed in individuals whose sugar consumption was restricted from conception (“in utero”) to around two years of age.

Sugar and its Dangers

Health experts have long pointed out that the first 1,000 days of life (from conception to around two years of age) are a critical period during which nutrition can influence long-term health. Current guidelines recommend avoiding sugary drinks and highly processed foods (which often contain a lot of sugar) when infants and toddlers begin to eat solid foods.

Taste preferences are formed in the first years of life. If children become accustomed to very sweet foods at an early age, they are more likely to prefer highly sweetened foods and beverages later on. This can lead to higher overall sugar intake in the long term. In addition, sugar provides “empty calories.” It contains a lot of energy but hardly any vitamins, minerals, or fiber. A baby’s stomach is small—when it is filled with sweet drinks or highly processed snacks, there is less room for nutrient-rich foods such as vegetables, fruit, whole grains, or protein-rich foods, which are important for growth, brain development, and the immune system.

Another important point is dental health. Sugar can cause tooth decay even in the first milk teeth. Sugar serves as food for bacteria in the mouth; they produce acids that attack the tooth enamel. Sugary drinks in baby bottles are particularly problematic because they bathe the teeth for a long time.

In addition, a consistently high sugar intake is associated with an increased risk of obesity, metabolic disorders, and later on, diseases such as type 2 diabetes. Although such problems do not develop from individual portions, early eating habits influence later eating behavior and thus long-term health.

A Natural Experiment Using British Sugar Rationing

To investigate whether sugar restriction in this early period affects future heart health, the researchers took advantage of a unique historical event. Sugar rationing in the UK ended in September 1953, allowing for a natural comparison between children born before and after this policy change.

The analysis included 63,433 participants from the UK Biobank with an average age of 55 who were born between October 1951 and March 1956 and had no previous heart disease. Of these, 40,063 were exposed to sugar rationing during their childhood, while 23,370 were not affected.

The researchers linked the participants’ health data to monitor the incidence of cardiovascular disease (CVD), heart attacks, heart failure, cardiac arrhythmias (atrial fibrillation), strokes, and deaths due to cardiovascular disease. The analysis took into account genetic, environmental, and lifestyle factors that could influence heart health. An additional comparison group of adults born outside the UK who had not experienced sugar rationing or similar policy changes around 1953 was also included to corroborate the findings.

Lower Cardiovascular Risk and Delayed Onset

The study found that longer exposure to sugar rationing was associated with a steadily lower risk of cardiovascular disease in adulthood. Part of this benefit appeared to be due to lower rates of diabetes and high blood pressure among those who were exposed to rationing at a young age.

Compared to people who were never exposed to rationing, individuals who were exposed to rationing in utero and during the first 1–2 years of life had a 20% lower overall risk of cardiovascular disease. They also had a lower risk of heart attack (25%), heart failure (26%), atrial fibrillation (24%), stroke (31%), and cardiovascular death (27%).

In addition to the lower risk, heart problems tended to occur later in life. Those who were exposed to sugar rationing before birth and in early childhood experienced the onset of cardiovascular disease up to two and a half years later than those who were not exposed to rationing. The researchers also observed moderate but significant improvements in heart health in individuals who were affected by rationing.

Sugar Restrictions and Modern Dietary Recommendations

During the rationing period, sugar intake was limited to less than 40 g per day for the entire population, including pregnant women and children, and infants under 2 years of age were not allowed to consume any sugar at all. These limits are largely in line with today’s dietary recommendations for young children.

As this was an observational study, it cannot be proven that lower sugar intake directly led to better heart health. The researchers point to several limitations, including the lack of detailed individual dietary records and the possibility of memory bias.

Nevertheless, they emphasize that the large size and careful design of the study allowed them to compare different periods of exposure and investigate possible links between early sugar intake and later cardiovascular health. “Our findings underscore the cardiac benefits of early childhood interventions focused on sugar rationing. Further studies should examine dietary exposure at the individual level and consider the interactions between genetic, environmental, and lifestyle factors to develop more personalized prevention strategies.”