Rolled oats with berries and walnuts
Rolled oats with berries and walnuts: GI 55 oats, a little fruit and some fat. One of the steadiest hot breakfasts in the index.
- Digestible carbs
- 29 g
- GI
- 54
- Glycemic load
- 16
- In cans of cola
- 0.7
Oats come in three speeds. Instant oats score 79, rolled oats 55 and steel-cut oats about 52.
Instant oatmeal with brown sugar is about one and a half times the load of this bowl.
What the hill looks like
Here's the meal next to its swap in our teaching model, drawn for a healthy adult from published averages. Your own curve will differ, but the gap between the two is the point.
- Rolled oats with berries and walnuts peaks near 100 mg/dL (5.6 mmol/L) at 50 minutes and is 94 at two hours.
- Instant oatmeal with brown sugar peaks near 106 mg/dL (5.9 mmol/L) at 50 minutes and is 97 at two hours.
A teaching model built from published averages for a healthy adult, not a prediction for you. People eating the same meal can differ a lot. How the model works
What would flatten it
- Make it smaller. Half the starch is half the load, since the load is carbs times GI.
- Walk for 10 minutes after. In 41 adults with type 2 diabetes, 10-minute walks after each meal made the rise 12% smaller than one daily walk, and 22% smaller after dinner.
- Eat the protein and vegetables first. The same meal with the carbs 10 minutes later lowered the peak by more than 40% in 15 people with prediabetes.
- Swap the drink. Any sweet drink on the side adds its whole load, and water adds none.
Run this meal in the simulator, switch on a walk or carbs last, and watch where the sugar goes.
What the numbers rest on
GI worked out from its parts.
- Oatmeal, rolled: 21 g digestible carbs from USDA Nutritive Value of Foods, item 433, p. 38: Regular, quick or instant, plain, nonfortified, 1 cup (234 g). GI 55, Atkinson 2008 Table 1, Porridge, rolled oats.
- Blueberries, 1 cup x 0.5: 8.1 g digestible carbs from USDA Nutritive Value of Foods, item 283, p. 30: Raw, 1 cup (145 g). GI 53, Sydney GI database, Blueberries, wild (Canada 2004-2007).
- Also on the plate, with little or no digestible carbs: walnuts.
This is about blood sugar for people without diabetes. If you take insulin or a sulfonylurea, your targets and meal plan come from your prescriber.
The 100 meals that raise blood sugar most · The 100 that keep it steady
7 sources
- US Department of Agriculture, Agricultural Research Service, Nutritive Value of Foods, Home and Garden Bulletin 72, 2002ars.usda.gov
- Atkinson FS, Foster-Powell K and Brand-Miller JC, International tables of glycemic index and glycemic load values, Diabetes Care, 2008pmc.ncbi.nlm.nih.gov
- University of Sydney, Glycemic Index Research and GI Database, accessed November 15, 2026glycemicindex.com
- Sydney University's Glycemic Index Research Service (Sydney, Australia), unpublished observations, via the University of Sydney GI databaseglycemicindex.com
- Reynolds AN and others, Advice to walk after meals is more effective for lowering postprandial glycaemia in type 2 diabetes than advice that does not specify timing, Diabetologia, 2016pubmed.ncbi.nlm.nih.gov
- Shukla AP and others, The impact of food order on postprandial glycaemic excursions in prediabetes, Diabetes, Obesity and Metabolism, 2019pubmed.ncbi.nlm.nih.gov
- Hutchins KM and others, Continuous glucose monitor overestimates glycemia, American Journal of Clinical Nutrition, 2025pmc.ncbi.nlm.nih.gov
