03/02/2026
Here’s something that might surprise you: the classic “sugar rush” isn’t as scientifically solid as we’ve been led to believe.
The idea that sugar makes kids hyper mostly traces back to a small study from the 1970s. Since then, dozens of larger, well-designed studies have found that sugar does not significantly impact behavior, attention, or school performance for most children.
One particularly fascinating study explored parental expectations. Researchers told some mothers their sons had consumed sugar—even when they hadn’t. Those mothers rated their children as more hyperactive and were more likely to closely monitor them. In other words, belief influenced perception. (Hoover & Milich, 1994)
So at birthday parties, what looks like a “sugar high” may actually be excitement, noise, friends, games, and a break from routine. That’s a lot of stimulation for a small nervous system.
That said, this isn’t a free pass for unlimited sweets. Added sugars are linked to childhood obesity, type 2 diabetes, dental cavities, and lower overall diet quality. Most children in the U.S. consume more added sugar than recommended. When kids fill up on sugary drinks and snacks, they often eat less of the fruits, vegetables, whole grains, lean proteins, and dairy their growing bodies need.
It also helps to remember: not all sugars are the same. Whole fruits contain natural sugars packaged with fiber, water, and nutrients that support steadier energy. Candy and soda deliver quick spikes with little nutritional value.
Before blaming the cupcake, it may be worth scanning the environment first. And overall, focusing on reducing added sugars for long-term health is where the real evidence points.
Sources:
Hoover, D.W., & Milich, R. (1994). Effects of sugar ingestion expectancies on mother-child interactions. Journal of Abnormal Child Psychology, 22(4), 501–515. doi:10.1007/BF02168088
University of Utah Health (2025). Debunking Old Wives’ Tales: Why Your Child Isn’t Actually Sugar High. The Scope – Kids Zone. https://healthcare.utah.edu/the-scope/kids-zone/all/2025/08/debunking-old-wives-tales-why-your-child-isnt-actually-sugar-high
Academy of Nutrition and Dietetics. Sugar: Does It Really Cause Hyperactivity? EatRight.org. https://www.eatright.org/health/wellness/healthful-habits/sugar-does-it-really-cause-hyperactivity