Blood sugar rises after eating, and a temporary increase in glucose is not necessarily a sign of poor health. The growing popularity of continuous glucose monitors among people without diabetes has, however, fuelled concern about normal post-meal fluctuations.
Research tracking glucose levels in people without diabetes has shown clear rises after meals. In one study of healthy adults, the average peak post-meal glucose level was about 143 mg/dL, demonstrating that measurable glucose excursions can occur even in people without diabetes.
Carbohydrates are a major factor because they are broken down into glucose. The size and speed of a rise can vary depending on the food, portion size and what it is eaten with. The CDC notes that combining carbohydrates with protein, fat or fibre can slow the rate at which blood sugar rises.
A single glucose spike should therefore not be treated as a diagnosis or proof that a particular food is damaging health. Diabetes and prediabetes are assessed using established tests such as fasting blood glucose, oral glucose tolerance testing and HbA1c, rather than isolated post-meal readings.
For people with diabetes, managing post-meal glucose remains important, and individual targets can vary. The CDC gives a typical target of below 180 mg/dL two hours after the start of a meal for many adults with diabetes, while noting that personal targets should be determined with a healthcare professional.
The bigger concern is a consistent pattern of elevated glucose or abnormal results on appropriate medical testing, rather than an occasional rise after eating.

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