Seemingly healthy foods that can raise your blood sugar without you realising it

Many of us associate rising blood sugar levels only with sweets and sugary drinks. In reality, there are products considered ordinary or even healthy that can significantly affect blood sugar levels and, over time, glycated haemoglobin (HbA1c) values. Refined carbohydrates, concentrated sugars, and overly large portions all play an important role in this.

Fruit juice is no substitute for whole fruit

Even if the label says "100% fruit juice", the product may contain a concentrated amount of natural sugars. When fruit is turned into juice, much of the dietary fibre is lost — fibre that would naturally slow the absorption of sugars. For this reason, a whole piece of fruit is preferable to a glass of juice, even if they come from the same source.

Flavoured yoghurts and "healthy" drinks can conceal sugar

Plain yoghurt can fit into a balanced diet, but fruit-flavoured varieties often contain significant amounts of added sugar. The same applies to sweetened coffee, energy drinks, and certain packaged smoothies. The difference between the plain and sweetened versions of the same product can matter for those monitoring their blood sugar.

White bread, rice, and potatoes don't taste sweet, but they can raise blood sugar

A sweet taste is not a reliable indicator of a food's effect on blood sugar. White bread, white rice, potatoes, and many baked goods contain refined carbohydrates that, after digestion, can cause rapid spikes in blood sugar levels. Controlling blood sugar therefore means more than simply cutting out sweets.

Dried fruits can concentrate large amounts of sugar

Raisins, dates, figs, and dried apricots contain vitamins, minerals, and fibre, and are not automatically unhealthy. However, the drying process removes water and concentrates the natural sugars, and it is far easier to consume a large quantity of dried fruit than the equivalent amount of fresh fruit. A seemingly small portion can, in fact, be equivalent to several servings of fresh fruit.

"Low-fat" products are not necessarily better for blood sugar

"Low-fat" or "diet" labels can give the impression that a product is automatically suitable for blood sugar management. However, when fat is reduced, manufacturers sometimes add sugar or refined starch to restore flavour and texture. Specialists recommend checking the nutritional information and the ingredients list, rather than relying solely on marketing claims.

Cutting out carbohydrates entirely is not the answer

A diagnosis or elevated blood sugar leads some people to eliminate carbohydrates from their diet almost entirely. According to the doctor cited in the source material, this approach is not necessarily the right one — carbohydrates are the body's primary source of energy. A more sustainable strategy is to build balanced meals rather than following extremely restrictive diets. What matters is the type of carbohydrates consumed, the quantity, and how they are combined with other foods in a meal.

Simple changes that can help

Radical changes are not required. A few simple swaps can reduce the intake of sugar and refined carbohydrates:

• choosing whole fruit instead of fruit juice;
• eating plain yoghurt instead of sweetened varieties;
• replacing white bread with wholegrain alternatives;
• reducing consumption of ultra-processed foods;
• controlling portion sizes of rice and potatoes;
• being mindful of the amount of dried fruit consumed.

HbA1c is the test used to assess average blood sugar levels over a longer period of time. This is why eliminating a single food matters far less than the dietary habits repeated consistently over weeks and months.