Could Your “Diet” Drink Be Making You Hungrier?
You reach for a “diet” soda, thinking you’re making the healthier choice…
No sugar. No calories. No guilt.
But what if that very choice is sabotaging your health goals?
A groundbreaking new study from the University of Southern California reveals that sucralose—the popular artificial sweetener found in products like Splenda—might do something unexpected: It could make you hungrier.
Using sophisticated MRI scans, researchers found that sucralose triggers brain signals linked to hunger and reward, especially in women and people with healthy body weights. These signals were stronger than those triggered by regular sugar—and even water.
In other words, sucralose may activate hunger-related pathways in the brain, encouraging overeating instead of curbing it.
In the study, participants consumed drinks sweetened with either sucralose, regular sugar, or plain water. The researchers then measured blood flow to the hypothalamus—a part of the brain responsible for managing hunger and fullness.
Here’s what they discovered:
- Sucralose increased hypothalamic activity more than both sugar and water.
- This effect was most pronounced in women and people at healthy weights.
- Participants who drank sucralose-rated beverages reported feeling hungrier afterward—despite consuming no calories.
The study also showed that sucralose may alter how the brain’s reward system processes sweetness. Normally, when you eat sugar, your brain gets the calories it expects. But sucralose delivers the sweet taste without the calories—confusing the brain and possibly disrupting natural appetite control.
Non-caloric sweeteners like sucralose are often marketed as tools for weight loss or blood sugar control. But this research suggests they may do the opposite—driving up hunger signals, increasing cravings, and promoting overeating.
And while this study focused on healthy young adults, its findings could carry real implications for seniors, especially those trying to manage weight, diabetes, or appetite changes.
Let’s not forget: as we age, our appetite cues and hormone responses change. Artificial sweeteners might interfere with these systems in ways we don’t fully understand.
That’s up to you—and your doctor.
But based on this study, it may be wise to cut back on artificial sweeteners if you’re struggling with persistent hunger or difficulty reaching your health goals. Even small swaps—like replacing diet soda with sparkling water flavored with citrus or herbs—can make a difference.
As nutrition expert Eliza Whitaker put it: “The brain expects calories when you taste something sweet. When that expectation isn’t met, your hunger doesn’t shut off.”
While more research is needed, this is yet another reminder that “zero calories” doesn’t always mean zero impact on your body—or your brain.
To ditching artificial sweeteners,
Rachel Mace
Managing Editorial Director, e-Alert
with contributions from the research team
