A weekend lunch of cup noodles, a triangle rice ball (samgak gimbap) and a can of cola from the convenience store may seem harmless. But when this combination becomes a habit, the risk of developing type 2 diabetes can rise by about 40%, according to a recent analysis.
Korea's diabetes prevalence reached 13.3% among men and 7.8% among women in 2024, both up from the previous year, according to the Korea Disease Control and Prevention Agency's 2024 National Health and Nutrition Examination Survey released Tuesday. Based on the Korean Diabetes Association's "Diabetes Fact Sheet 2024," one in seven adults aged 30 or older (14.8%) has diabetes, equivalent to 5.33 million people. Including pre-diabetes, the figure rises to 40% of adults aged 30 and older, and 50% of those aged 65 and older.
Data from the Health Insurance Review and Assessment Service showed the number of diabetes patients grew 73.3% over a decade, from 2,078,650 in 2014 to 3,602,443 in 2024. Among those in their 20s and 30s, the increase reached 79.8% over the same period, exceeding the average. The average daily sugar intake among Koreans stands at 59.8 grams, already surpassing the World Health Organization's recommended limit of 50 grams. About 16.9% of adults exceed the recommended intake, and roughly one-third of sugar consumed through processed foods comes from beverages.
Both cup noodles and triangle rice balls are refined carbohydrate foods that have undergone milling and processing. They are absorbed quickly by the body, sharply raising post-meal blood sugar levels. When a soda containing high-fructose corn syrup is added, both the speed and total amount of blood sugar elevation increase simultaneously.
When blood sugar rises rapidly, the pancreas secretes excessive insulin to lower it. Repeating this process leads to insulin resistance, in which cells become less responsive to insulin, while the burden on pancreatic function accumulates. Endocrinologists point to the combination of cup noodles, triangle rice balls and soda as a typical high-risk pattern that drives blood sugar up sharply in a short time. The problem lies not so much in any individual food, but in the structure of overlapping refined carbohydrates topped with added sugar.
A single 350-milliliter can of soda consumed with a meal contains about 35 to 39 grams of sugar. That alone fills 70% of the WHO's daily recommended intake. This is why beverages account for 32.7% of sugar intake from processed foods.
Changing eating habits overnight is difficult. Experts advise that adjusting the composition of convenience store meals, rather than eliminating them entirely, is a realistic starting point. There are three key approaches.
First, change the drink. Choosing bottled water or unsweetened sparkling water instead of cola or cider can cut more than 35 grams of sugar per meal. Unsweetened tea beverages such as barley tea or corn silk tea are also alternatives.
Second, add protein. Eating boiled eggs, soft tofu or chicken breast products together slows the rise in blood sugar compared with a carbohydrate-only meal. Protein takes longer to digest and absorb, helping maintain a feeling of fullness.
Third, add vegetables. Eating a convenience store salad or vegetable sticks at the beginning of a meal allows dietary fiber to slow carbohydrate absorption, acting as a buffer against blood sugar spikes. Studies have shown that simply changing the meal order to vegetables, then protein, then carbohydrates can alter blood sugar response even when eating the same foods.
In addition, light walking for 10 to 15 minutes after a meal helps muscles consume glucose, suppressing post-meal blood sugar spikes. When choosing a convenience store lunch box, it is also important to develop the habit of checking sugar and sodium content on the nutrition label. According to an analysis by the Ministry of Food and Drug Safety, people who check nutrition labels on food packaging consume 6.5 grams less sugar per day, equivalent to about two sugar cubes, than those who do not.
