Summary: People living with diabetes often use sugar substitutes because they have zero calories and do not cause a spike in blood sugar. But new studies show they are not entirely safe for people with diabetic neuropathy. Sugar substitutes can still cause insulin resistance and changes in gut bacteria (gut microbiota). Both can worsen diabetic neuropathy symptoms. So researchers recommend using them sparingly and asking a doctor before adding them to a diabetic neuropathy treatment plan.
Sugars are carbs that digest fast. Once eaten, they cause a quick spike in blood sugar and a sudden rise in insulin. Eating sugar often can speed up insulin resistance. That is why doctors advise cutting back on sugar when you live with diabetes. But, of course, people still want to satisfy a sweet tooth. One way is to use sugar substitutes. These can be synthetic or natural, like saccharin or stevia.
Sugar substitutes are unique in a few ways. They have zero calories and do not turn into glucose. So they do not cause any spike in blood sugar. Yet they are much sweeter than regular table sugar. So a tiny amount can make drinks and desserts taste sweet. The use of sugar substitutes is rising. They are added to drinks and foods often sold as low-calorie or even zero-calorie. But are these foods and drinks really safe? Are these sugar substitutes as good as people assume?
New studies show that they are fairly safe, but not entirely safe. They may still make your diabetes worse. They can harm health in many ways, above all if you consume large amounts, thinking they are completely safe. Of course, the degree of harm varies. Some are less harmful, and others more. So no one should overuse sugar substitutes on the belief that they are completely safe. Which raises a question: if they have no calories and do not raise blood sugar, how could they harm health?
Researchers now know two ways sugar substitutes may harm health. There are likely other ways, too. Researchers were amazed to see that many sugar substitutes can still increase insulin resistance. It appears that sugar substitutes trick the brain. The brain still thinks a person is eating something sugary. So the body’s feedback system still responds, just as it would after eating sugar.
All this means that sugar substitutes still raise insulin release, and so, over time, they cause insulin resistance, much like regular sugar. Of course, this rise in insulin will be lower than the rise from table sugar. But it is still there. Another problem is that sugar substitutes change gut bacteria. These sweeteners add no calories, but they reach the large intestine, where most gut bacteria live. Over the long run, sugar substitutes like saccharin, sucralose, and stevia can change gut microbiota composition.
Of course, these substances are safe, and there is nothing to worry about. They are not going to cause any significant change right away. Still, these findings matter. They show that no one should overuse these substances on the belief that they are completely safe. These sugar substitutes are safer than table sugar in many ways. They contain no calories, so they do not raise blood sugar. But if a person starts using too much, they might cause insulin resistance, changes in gut bacteria, and even low-grade inflammation.
This does not mean you should stop using sugar substitutes. It means you should not overuse them on the belief that they are totally safe. Used now and then, they are quite safe. It is our mission to bring real hope and transformational change to patients who would otherwise be consigned to a lifetime of medications, doctor’s visits, and suffering. We expose misaligned incentives and return the power of health to the individual. We believe empowered individuals change their communities. We use a combination of lifestyle intervention, medication management, and emerging scientific research to help our patients. When you are ready or have questions, reach out.
Frequently asked questions
Are sweeteners worse than sugar for diabetics?
No, but they are not free. Sugar substitutes have zero calories, do not turn into glucose and do not spike blood sugar. So they are safer than table sugar in many ways. They still raise insulin release, less than table sugar does. And heavy use can build insulin resistance over time. Use them sparingly, not as a license.
Can artificial sweeteners cause insulin resistance?
Yes, with frequent heavy use. The sweet taste tricks the brain into reacting as if sugar arrived, so the body still releases insulin. That rise is smaller than after table sugar, but it is real. Over time it pushes the body toward insulin resistance, the same way regular sugar does.
Do artificial sweeteners affect gut health?
Yes. Sweeteners add no calories, but they travel to the large intestine, where most gut bacteria live. Over the long run, sweeteners such as saccharin, sucralose and stevia can change the makeup of the gut microbiota. Heavy use is also tied to low-grade inflammation. That is one more reason not to treat them as harmless.
Are sugar substitutes safe with diabetic neuropathy?
Used now and then, yes. But some people use them heavily, believing they are completely safe. Then they can add to insulin resistance and gut microbiota changes, and both can worsen diabetic neuropathy symptoms. Researchers recommend using them sparingly. Talk with your doctor before building them into a diabetic neuropathy treatment plan.
Medical Disclaimer: Keep in mind that the content provided is not direct medical advice for patient care, but is provided for thoughtful discussion.
Dr. Gurpreet Singh Padda, MD, MBA, MHP
