Sugar: It's sweet, it's tempting, and it's everywhere. But what exactly is it doing to your body, and how can you avoid the inevitable energy crash?
We're naturally drawn to sugar. Think back to our ancestors, who savored honey as a rare, high-energy treat. Today, with sugar readily available and our lifestyles less active, that sweet tooth can work against us. Many of us consume excessive amounts, leading to potential health issues. But is there more to the story than just too many calories and not enough nutrients?
"The moment sweetness touches your tongue, your body starts reacting," explains Dawn Menning, a registered dietitian. "The brain recognizes sugar as a quick energy source, triggering the reward system and releasing dopamine, the feel-good chemical." Interestingly, not everyone experiences sweetness the same way. Research in 2015 compared how different siblings perceive sugar and sweeteners, revealing that identical twins have similar sweet taste perceptions more than fraternal twins or non-twin siblings. Genetics account for about 30% of the variation in our sensitivity to sweet tastes, but it's unclear if this impacts how much we eat.
What happens after that first taste depends on the type of sugar. Glucose, found in table sugar, treats, and starchy carbs, has slightly different effects than fructose, common in fruits and juices.
"Glucose prompts the pancreas to release insulin," says Sarah Berry, a professor of nutrition. "Insulin removes glucose from circulation, storing it for energy as glycogen in muscles or the liver, or converting it into fat." Fructose, on the other hand, doesn't trigger insulin release. "It goes straight to the liver, where it can be converted to glycogen or, if consumed in excess, converted to fat." And this is the part most people miss...
Excessive consumption of both glucose and fructose can elevate triglycerides, a type of fat in your blood. While essential for energy, high levels increase the risk of heart disease, stroke, and pancreatitis. Fructose is a greater concern for those at risk of fatty liver syndrome, while glucose poses a challenge for people with insulin regulation issues. Which one you should worry about more depends on your lifestyle and genetics.
"Repeated, excessive insulin peaks can increase inflammation," says Berry. "While inflammation is a normal bodily process, chronic, excessive inflammation can become problematic."
The sugar rush? It's largely a myth. A 1995 meta-analysis found no behavioral or cognitive effects in children from sugar consumption, suggesting parental expectations play a role. A 2019 meta-analysis found no mood-boosting effects from carbohydrates (including sugar), noting increased fatigue and decreased alertness within the first hour post-ingestion. But even if our sugar-crazed children are just reacting to the placebo effect, the real problem is the crash.
"Research shows that after a sugar dip, people feel hungrier and consume an average of 80 more calories at their next meal and 320 more calories throughout the day," says Berry. "A breakfast high in carbohydrates can easily lead to a dip, causing you to overeat later."
It's not just how much sugar, but when and how you eat it. "Blood sugar response is more favorable in the morning," says Berry. "Our bodies also handle sugar better when it's part of a balanced meal with healthy fats and proteins. Trying to 'flatline' your glucose response, as some influencers suggest, is unnecessary. A blood glucose increase is a normal response to eating; we just need to ensure it's not excessive."
The takeaway? We consume more sugar than we need. A recent study by the Oral Health Foundation revealed that 84% of us eat at least one sugary snack daily, with 79% consuming up to three. Eating less is a good idea, but there's no need to eliminate sugar entirely. Enjoy it in moderation, preferably earlier in the day, and alongside fiber, healthy fats, or protein.
But here's where it gets controversial... What about sugar substitutes? They might not be the foolproof solution you're hoping for. While they don't seem to spike insulin or trick hunger hormones, the problem may lie elsewhere.
"Emerging evidence suggests that sweeteners like saccharin and sucralose can affect your oral and gut microbiome," says Berry. "More research is needed to understand the long-term effects on health outcomes like blood pressure, insulin resistance, and weight." Recent research suggests that some sweeteners can be converted to fructose in the body, triggering similar effects to regular sugar.
Until more is known, enjoy sweetness from sugar – it's what we've evolved to do. But remember: our ancestors didn't have access to the quantities we do, and they were likely a lot more active. What do you think? Are you surprised by any of these findings? Share your thoughts in the comments!
