7 'Healthy' Foods That Secretly Spike Your Blood Sugar Levels

Many foods marketed as healthy can cause unexpected spikes in blood sugar levels. A new analysis highlights seven common items that may disrupt glucose balance, even when they seem nutritious. The findings align with research from Glucose Revolution, a book by biochemist Jessie Inchauspé, which explores science-backed ways to manage blood sugar.

Oatmeal, often seen as a wholesome breakfast, can raise blood glucose more than expected. Experts recommend choosing high-fibre, no-sugar-added versions to reduce this effect. Similarly, plant-based milks—particularly oat and rice varieties—contain natural or added sugars that push glucose levels up.

Smoothies and protein shakes made with multiple carb-heavy ingredients or sweetened powders can also trigger sharp increases. Even sushi, despite its lean protein and vegetables, can cause unexpected spikes due to its rice content. Rice cakes, another seemingly light snack, have a high glycemic index and can lead to rapid glucose rises. Sauces and dressings with high carb counts or added sugars often have a high glycemic index as well. Protein bars, unless carefully formulated, may contain hidden sugars or lack the right balance of protein, fat, and carbs. Checking labels for total sugar and added sugars is key, as many 'healthy' foods hide surprisingly high amounts.

The seven foods—oatmeal, plant-based milks, protein bars, sushi, sauces, smoothies, and rice cakes—can all impact blood sugar more than expected. Understanding their effects helps in making better dietary choices. Inchauspé's work in Glucose Revolution provides further strategies for keeping glucose levels stable.