Canadian Study: Eggs Before Bed May Beat Yogurt for Blood Sugar

Canadian Researchers Challenge Common Bedtime Snack Advice for Type 2 Diabetes

A study from Canada, published in Clinical Nutrition, is raising new questions about a long-standing piece of diabetes advice: the bedtime snack. Researchers at the University of British Columbia Okanagan explored whether the type of bedtime snack matters just as much as whether you eat one at all — and the results may surprise you.

Why This Research Stands Out

Many US patients with type 2 diabetes have been told by their care team that a bedtime snack can help stabilize overnight blood sugar. However, the specific food composition of that snack has rarely been studied head-to-head. Canadian researchers took a closer look, directly comparing a low-carbohydrate, protein-rich snack (whole eggs) against a high-carbohydrate, protein-matched snack (yogurt) — and a no-snack control condition — in a rigorous crossover trial.

This type of controlled design, where each participant tries all three conditions, is particularly valuable because it reduces the variability that can muddy results in larger population studies common in US research.

What the Study Did

Fifteen adults with type 2 diabetes rotated through three three-day conditions, each with the same total daily calories:

• Egg snack: A low-carbohydrate, protein-rich bedtime snack
• Yogurt snack: A high-carbohydrate, protein-matched bedtime snack
• No bedtime snack: Calories distributed across other meals

Participants wore continuous glucose monitors (CGMs) throughout the study, and fasting blood draws were taken each morning of day four to measure blood sugar and insulin levels.

What They Found — In Plain Terms

Compared to the yogurt snack, the egg snack produced measurably better results:

• Lower fasting blood sugar in the morning (a statistically significant reduction)
• Lower overnight (nocturnal) blood sugar — a strong effect by research standards
• Lower fasting insulin levels
• Better insulin sensitivity, measured by a standard marker called QUICKI

However — and this is important — neither snack was significantly better than eating no bedtime snack at all. The key advantage was egg over yogurt, not snack over no snack.

How This Compares to US Guidelines

Current American Diabetes Association (ADA) guidelines do not specifically recommend bedtime snacks for most people with type 2 diabetes, leaving the decision largely to individual care plans. This Canadian study supports a more nuanced approach: if a bedtime snack is part of your routine, the carbohydrate content matters. A lower-carb, protein-focused choice appears to be the better option.

Why This Matters for US Patients

Elevated fasting blood sugar is a common frustration for Americans managing type 2 diabetes, often driven by the liver releasing excess glucose overnight — a process worsened by insulin resistance. This study suggests that if you do snack before bed, reaching for eggs or another low-carb, high-protein option instead of yogurt, crackers, or fruit may help blunt that morning spike. While the study was small (15 participants) and short (three days per condition), the effect sizes were meaningful enough to warrant attention.

Tracking your fasting glucose consistently is essential to knowing whether any dietary change is actually working for you. Tools like continuous glucose monitors and reliable blood glucose meters available at mdsdiabetes.com can help you see how your bedtime habits affect your morning numbers in real time.

Citation

Abbie, Francois, Chang (2020). A low-carbohydrate protein-rich bedtime snack to control fasting and nocturnal glucose in type 2 diabetes: A randomized trial. Clinical Nutrition (Edinburgh, Scotland). PMID: 32204977. DOI: 10.1016/j.clnu.2020.03.008. [Country of Origin: Canada — University of British Columbia Okanagan]