Does Intermittent Fasting Help with Blood Sugar?
Medically reviewed by Faith Coleman, University of New Mexico School of Medicine on August 21st, 2026.
Intermittent fasting has been shown to improve blood‑sugar regulation and insulin sensitivity. Time‑restricted eating patterns, such as the 16:8 schedule (eating for an 8-hour interval daily), and alternate‑day fasting are the most studied approaches. Clinical trials demonstrate that these methods can reduce fasting glucose by approximately 3–6% and lower fasting insulin. Meta‑analyses involving more than 1,000 participants report modest reductions in HbA1c, typically 0.1–0.3% in individuals without diabetes, and up to 0.5–0.9% in those with type 2 diabetes, depending on weight loss and medication adjustments. During fasting periods, hepatic glycogen depletion and reduced insulin levels improve metabolic flexibility and insulin responsiveness. Individuals with diabetes or glucose‑regulation disorders should consult their healthcare provider before beginning any fasting regimen, as medication adjustments may be required to prevent dangerous blood sugar drops.
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