As we all know, eating too many staple foods or fruits can increase carbohydrate intake, which may raise postprandial blood glucose. However, in daily life, many people with diabetes strictly control their intake of staple foods and fruits and eat mostly vegetables, yet their postprandial blood glucose still rises above 10.0 mmol/L.
If you often have this problem, it may be related to these 4 hidden high‑carbohydrate foods.
Carbohydrate Intake Affects Postprandial Blood Glucose
Carbohydrates in food are digested by the body and eventually enter the bloodstream as glucose. They are the body’s most important energy source and the main cause of elevated postprandial blood glucose.
Postprandial blood glucose level is related not only to the glycemic index (GI) of carbohydrates but also to the total carbohydrate content in food.
Therefore, for people with diabetes to control postprandial blood glucose well, they must choose low‑GI foods and control total carbohydrate intake.Besides staple foods and fruits, carbohydrates in some non‑staple foods cannot be ignored.
4 Easily Overlooked High‑Carb Foods
- Sweet Bean Paste / Sweet Flour Sauce
We know leafy greens are rich in dietary fiber, which can interfere with glucose absorption in the small intestine and help lower postprandial blood glucose.
To eat more leafy greens, many people with diabetes dip them in sweet bean paste — yet their blood glucose rises instead of falling.The problem is not the vegetables, but the sweet paste.
Sweet bean paste is made from flour or wheat via fermentation, tasting mainly sweet with a slight salty and umami flavor.It raises postprandial blood glucose mainly due to its high carbohydrate and sodium content.
Taking one popular brand as an example: 100 g of sweet bean paste contains 24 g of carbohydrates — higher than in an average apple
100 g contains 3353 mg of sodium (2000 mg sodium ≈ 5 g salt)
Dipping vegetables in sweet paste unknowingly increases carbohydrate and salt intake, both of which impair postprandial glucose control.
Tip:Avoid dipping leafy greens in sweet paste.Use stir‑frying, mixing, steaming, or boiling with less oil and less salt.
- Edamame
Edamame is rich in protein, fat, vitamin A, B1, B2, C, E, and other nutrients.Its dietary fiber content is as high as 4.0%, making it the “fiber champion” among vegetables.It helps prevent and assist in treating obesity, hyperlipidemia, hypertension, and diabetes.
Many people with diabetes enjoy edamame in summer and treat it as an ordinary vegetable.
However, edamame is a high‑energy vegetable: 100 g edamame: 131 kcal, 10.5 g carbohydrates
For comparison:
100 g cherries: 46 kcal, 10.2 g carbohydrates
Edamame has similar carb content to cherries but nearly 3 times the calories.
Tip:Eat edamame in limited quantities like fruit — about one handful per day.This satisfies cravings and provides nutrients without spiking blood glucose.
- Garlic Scapes
Since garlic scapes are green, many people with diabetes regard them as low‑carb leafy greens.In fact, they are high‑energy vegetables: 100 g garlic scapes: 66 kcal, 15.4 g carbohydrates
This carb level is similar to canned peach in syrup (14.5 g per 100 g).
Tip:Limit garlic scape intake.Combine them with other high‑fiber leafy greens.
- Potatoes
Although sold as vegetables, potatoes are not friendly to postprandial blood glucose if eaten as a regular vegetable. 100 g potatoes: 81 kcal, 17.8 g carbohydrates
This is similar to the carb content of mangosteen (18 g per 100 g).
Even though potatoes are not sweet, eating them in large quantities as vegetables strongly raises blood glucose.
Tip:Treat potatoes as a staple food, not a vegetable.If you eat 200 g of potatoes, reduce your staple food by about 50 g.
Besides these four hidden high‑carb foods, lotus root, Chinese yam, and carrots also contain considerable carbohydrates and should be eaten in limited amounts.