What foods should I avoid with high blood sugar?

Ranked by how hard they hit

1. Liquid sugar. Soda, fruit juice, sweetened coffee drinks, sports drinks. The fastest and steepest rise of anything, because there is no fibre or structure to slow absorption. Even 100% juice with no added sugar behaves this way. This is the single highest-yield change most people can make.

2. Refined flour products. White bread, most breakfast pastries, crackers, many cereals. Grinding grain into flour destroys the structure that slows digestion — whole oats and instant oat cereal contain similar carbohydrate and produce very different curves.

3. Sweetened breakfast cereals. Often the worst start to a day available, and frequently marketed as healthy.

4. Large portions of starch eaten alone. A bowl of white rice or pasta with nothing alongside it. The same food with protein, vegetables and olive oil behaves quite differently.

5. Packaged snacks and confectionery. Predictable, and usually the easiest to displace.

Why avoid is the wrong frame

Very little genuinely needs banning. Framing food as forbidden tends to produce a cycle of restriction and rebound that leaves people worse off than a workable approach they can actually sustain.

Three changes move numbers more than any avoidance list:

• Order. Vegetables and protein before the carbohydrate portion. This reliably lowers the post-meal peak, and it is free.
• Pairing. Never eat carbohydrate alone. Nuts with fruit, yoghurt with berries, olive oil on bread.
• Portion. Restaurant and packaged portions have grown steadily. A "bowl of rice" can plausibly mean 40 grams of carbohydrate or 110.

The ones that surprise people

• Smoothies — better than juice, but blending still speeds absorption
• Low-fat flavoured yoghurt — often high in added sugar
• Dried fruit — concentrated sugar in a small volume, easy to overeat
• "Sugar-free" baked goods — usually still refined flour, which becomes glucose anyway
• Rice cakes — very fast-digesting despite the low-calorie reputation

What to add rather than remove

Legumes, non-starchy vegetables, whole intact grains, nuts, eggs, fish, olive oil. Adding fibre and protein to what you already eat is usually easier to sustain than removing things, and it produces most of the same benefit.