The Dr. Layne Norton Podcast Study Deep Dive: Does Aspartame Increase Insulin?
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Feb 2, 2026 A deep dive into how aspartame is metabolized and why tiny doses in diet drinks matter. A clear look at randomized trial evidence versus observational claims about insulin and blood sugar. Discussion of study design, meta-analysis results, and how metabolites compare to normal dietary amino acids. Practical takeaways on aspartame’s impact on appetite, calories, and longer-term metabolic markers.
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Host's Diet Soda Moment
- Layne Norton jokingly introduced the episode by sipping his preferred diet soda.
- He clarified he receives no payment from soda or sweetener companies.
Studies Separated By Design And PKU
- The review included crossover and parallel RCTs and separated special populations like PKU.
- Studies on PKU were analyzed separately because phenylalanine metabolism differs markedly.
Aspartame Doesn't Raise Blood Glucose
- Meta-analysis of acute studies showed no effect of aspartame on blood glucose versus placebo.
- Sugars and nutritive carbohydrates produced much larger glucose responses than aspartame.