Does it make sense to limit blood sugar spikes, even without diabetes?
Limiting blood sugar spikes makes sense even without diabetes. The simplest and best-supported method is to take a short walk immediately after eating. Sweetener drinks are of no help if you end up eating more afterwards.
Post-meal blood sugar spikes vary considerably from person to person, even in people without diabetes. A study of 25 healthy individuals using a continuous glucose monitor found that people who process glucose more slowly experience higher spikes, and that a day-night rhythm exists that differs substantially between individuals1. 'Normal' blood sugar is therefore not a fixed benchmark for everyone.
The most practical and best-supported approach is to take a short walk immediately after eating. A meta-analysis (116 participants in total, small but consistent) showed a clear effect. Walking right after a meal significantly reduced the blood sugar spike. Walking before a meal had no measurable effect. The studies did carry a high risk of bias, so the evidence is promising but not yet definitive2.
Drinking mulberry leaf tea before a meal also shows positive signals. In a study of 31 healthy and pre-diabetic participants, blood sugar variability decreased significantly after two weeks of daily use. There were no side effects, such as low blood sugar or abnormal liver and kidney values. The tea inhibits carbohydrate digestion. Long-term safety has not yet been studied3.
Drinks sweetened with sweeteners such as aspartame, monk fruit or stevia may seem like a smart choice, but in a controlled study participants actually ate more at the next meal. As a result, the lower blood sugar spike was fully compensated. Measured over three hours, there was no difference in blood sugar or insulin compared with regular sugar4. Simply switching to sweeteners therefore offers little benefit if eating behaviour afterwards does not change.
Cinnamon in water, a compound from olives and isomaltulose as a sugar substitute also show some effect, but each comes with significant caveats: small studies, results only in patients with diabetes, a low sugar dose, or authors with ties to commercial producers5,6,7. That high spikes may be harmful over time is biologically plausible: a post-meal insulin spike prompts immune cells to adhere more strongly to blood vessel walls, both in mice and in healthy humans. What this means in the long term cannot, however, be inferred from that research8.
Eight studies used: one meta-analysis on walking (116 participants), one controlled study on sweeteners, one small human study on cinnamon (19 participants), one mechanistic study on insulin and immune cells, one small study in healthy humans on a compound from olives (commercial interest), one observational study with continuous glucose monitors (25 participants), one human study on mulberry leaf tea (31 participants), and one meta-analysis on isomaltulose in patients with diabetes (commercial interest). Most human studies are small; walking has the broadest body of support.