Diabetic Neuropathy: What It Is, Why It Happens, and How It Can Be Managed?

Diabetic neuropathy is one of the most common, and at the same time, least understood complications of diabetes mellitus. It affects nerves throughout the body, bringing with it a multitude of symptoms that can significantly reduce quality of life. From minor discomfort to severe complications, diabetic neuropathy requires a complex approach to be managed.

Learn more about diabetic neuropathy: what it is, what types it occurs in, and its specific symptoms. Discover dietary strategies or lifestyle changes that will help you prevent and improve it.

Diabetic Neuropathy: What It Is and How Many Types Exist?

High blood glucose levels over the long term have a toxic effect on the entire body. Nerves and the blood vessels that nourish them are particularly vulnerable. For this reason, diabetes is a difficult disease not only because of the restrictions it involves. Another significant problem is caused by the complications that can follow.

What is Diabetic Neuropathy?

Diabetic neuropathy is a common complication of diabetes mellitus. As a result of elevated blood glucose levels over long periods, the blood vessels that nourish the nerves and the nerve fibers themselves deteriorate. Thus, peripheral nerves suffer, and the patient begins to experience various neurological symptoms.

The mechanism by which chronic hyperglycemia leads to the onset of diabetic neuropathy involves a series of complex processes:

• First, prolonged hyperglycemia increases the production of free radicals: unstable molecules that can damage cells and vascular walls. This is how oxidative stress occurs, followed by progressive damage to nerve fibers and the blood vessels that nourish the nerves.
• Good blood supply is essential for nerve health. Through it, nerves receive nutrients and oxygen. Hyperglycemia affects small blood vessels, namely those that nourish nerves, and causes their walls to thicken, which reduces blood flow. Once the blood supply to the nerves is compromised, the nerves no longer receive the oxygen and nutrients they need to function correctly, so they deteriorate.
• When glucose levels are very high, some of this glucose enters an alternative metabolism process known as the polyol pathway. In this process, glucose is converted into sorbitol and fructose – two substances that can accumulate in nerve cells. These increase osmotic stress and affect electrolyte balance in cells. As a result, they become vulnerable to damage.
• Chronic hyperglycemia can also affect the function of Schwann cells, which form the myelin sheath of nerves. Myelin is necessary for the rapid transmission of electrical impulses along nerves. When myelin is damaged or the myelin sheath is destroyed, nerve conduction slows down or is interrupted. This leads to the characteristic symptoms of diabetic neuropathy.

All these mechanisms work together, damaging both peripheral and autonomic nerves, leading to the appearance of different types of diabetic neuropathy. In other words, diabetic neuropathy is the result of impaired nerve function, wherever in the body it may manifest: from hands and feet to internal organs.

How Many Types of Diabetic Neuropathy Are There?

There are four main types of diabetic neuropathy, each with distinct manifestations and effects on the body. Although all are related to diabetes, the severity and localization of symptoms vary significantly from person to person.

Peripheral Neuropathy (in the feet)

• The most common type is peripheral neuropathy, which primarily affects the feet and lower limbs. This form is often associated with symptoms such as tingling, numbness, burning sensation, or pain in the feet. Peripheral neuropathy progresses slowly, and patients begin to feel a loss of sensation, which predisposes them to foot injuries and ulcers that heal slowly.

Autonomic Neuropathy

• affects the autonomic nerves, those that control the body’s involuntary functions, such as digestion, heart rate, and blood pressure. This form can cause digestive problems, dizziness, or even heart problems.

Proximal Neuropathy

• occurs less frequently but is also more severe. It especially affects the hip, thigh, and buttock area. Most often, it is accompanied by severe muscle weakness and intense pain.

Focal Neuropathy

• involves sudden damage to a specific nerve or group of nerves, causing muscle weakness or pain in certain areas of the body, such as the face, trunk, or legs.

Mononeuropathies

• represent a form of neuropathy in which a single nerve or an isolated group of nerves is affected. Symptoms vary depending on localization, so there are several types. Mononeuropathy of the median nerve is one of the most common forms and occurs when the median nerve, which passes through the carpal tunnel in the wrist, is compressed or damaged. It is a very common type of mononeuropathy in diabetic patients, as is that of the femoral nerve (the nerve in the front of the thigh) or the sciatic nerve (the nerve that runs down the back of the leg). Other examples include cranial nerve mononeuropathy or thoracic mononeuropathy.

What Does Chronic Diabetic Neuropathy Mean?

Without being a distinct type, when we talk about chronic diabetic neuropathy, we refer to that form of the disease that develops gradually and persists over time. This usually occurs in patients with long-standing diabetes and poor blood glucose control. As nerves are affected over a long period, symptoms can become irreversible, and the sensation of discomfort can increase in intensity.

The most important thing to remember is that early identification and management of neuropathy, regardless of its type, is essential for preventing long-term complications.

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Onset of Diabetic Neuropathy: Symptoms and Manifestations

In diabetic neuropathy, the initial manifestations are mild. Most often, they can be ignored or confused with other problems. At first, patients may feel tingling, numbness, or burning sensations in their feet or hands, but they won’t become alarmed immediately. Over time, these symptoms can progress to more serious health problems that cause greater discomfort.

The symptoms of diabetic neuropathy in its early stages are:

• numbness;
• loss of sensation to pain or heat;
• tingling or a “pins and needles” sensation;
• mild pain;
• burning sensation, especially in the soles of the feet or toes;
• sensations of heat or cold;
• slight muscle weakness;
• muscle cramps or spasms, especially in the feet and calves, often occurring at night.

Thus, diabetic neuropathy symptoms initially appear in the extremities, especially the feet, and progress as the condition advances.

Symptoms of diabetic neuropathy can be easily overlooked or underestimated at first. However, early identification and treatment of the condition slow its progression. Furthermore, they prevent more severe complications, such as digestive or cardiovascular problems.

Diabetic neuropathy symptoms can be asymmetrical and vary significantly depending on the type of neuropathy present. For example, autonomic neuropathy can cause gastrointestinal problems, such as diarrhea or constipation. On the other hand, peripheral neuropathy is more commonly associated with symptoms in the feet.

The Impact of These Manifestations on Quality of Life and Daily Functioning

Numbness and loss of sensation increase the risk of injuries, burns, and cuts that the person does not feel and therefore does not treat in time. This risk is particularly dangerous in the feet, where lesions can develop into difficult-to-heal ulcers or infections, especially in diabetics. Patients may become anxious about walking barefoot and may avoid physical or social activities that involve walking.

Constant discomfort can affect rest, leading to chronic fatigue, irritability, and difficulty concentrating during the day. Patients may have trouble maintaining their daily routine, perform poorly at work or school, and develop sleep disorders.

Daily activities such as personal care, food preparation, housework, or driving can become more difficult. This can lead to a loss of independence, making patients dependent on help from others.

As they face physical limitations and persistent pain, patients may develop depression, anxiety, or other mood disorders. This is why diabetic neuropathy is considered a serious illness and requires complex management.

Diabetic Polyneuropathy: What It Means and How Can We Prevent It?

Knowing what diabetic neuropathy is, polyneuropathy should be easier to understand. This term refers to the simultaneous involvement of multiple nerves, especially in the extremities of the body. Diabetic polyneuropathy usually occurs in patients with type 1 or type 2 diabetes who have not maintained their blood glucose under control for long periods.

It is the most common form of diabetic neuropathy and can affect both sensory nerves (those that transmit sensations) and motor nerves (those that control movement). Patients may present a combination of symptoms, ranging from loss of tactile sensation and chronic pain to muscle weakness.

How Can We Prevent Diabetic Polyneuropathy?

Although there is no sure way to completely prevent diabetic polyneuropathy, there are a number of strategies and lifestyle changes that can be adopted. They can significantly reduce the risk of the onset or progression of this condition. These include:

• strict blood glucose control is the most important measure in preventing diabetic polyneuropathy: regular blood glucose monitoring, medication prescribed by the doctor, and adjusting insulin or oral medication doses are essential to achieve this control;
• a healthy, balanced diet with controlled carbohydrate content helps maintain blood sugar levels under control and reduces the risk of diabetes complications;
• overweight and obesity can worsen diabetes and increase the risk of diabetic neuropathy; maintaining a healthy body weight is essential;
• regular physical activity, such as walking, swimming, cycling, or light weight training, can improve insulin sensitivity, helping to control blood glucose;
• quitting smoking and limiting alcohol consumption can improve vascular health and nerve function;
• daily foot checks to identify cuts, blisters, or inflammation, wearing comfortable shoes that do not cause friction or pressure, and carefully trimming nails to prevent injuries;
• there is evidence that some supplements, such as alpha-lipoic acid, vitamin B12, or antioxidants, such as those in 100% Natural, Organic Aronia Juice – 3L, can have beneficial effects in preventing or alleviating the symptoms of diabetic neuropathy.

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Diabetic polyneuropathy is a serious complication of diabetes that can affect quality of life and daily functioning. Prevention is primarily based on rigorous blood glucose control, a healthy lifestyle, a balanced diet, regular exercise, and good foot care. By adopting these measures, diabetic patients can significantly reduce their risk of developing or progressing diabetic polyneuropathy.

Is Diabetic Neuropathy Reversible?

The question of whether diabetic neuropathy is reversible is frequently asked. Unfortunately, once nerves are damaged, they cannot be restored to their original state. However, the progression of the disease can be slowed down, and symptoms can be managed. This requires both medical interventions and lifestyle changes.

Strict control of glucose levels and early therapeutic interventions are essential. Maintaining blood sugar levels within normal limits prevents further nerve damage and can reduce symptoms associated with the condition.

Investigations in Diabetic Neuropathy

The diagnosis of diabetic neuropathy is based on medical history, physical examination, and specialized tests, such as electromyography or nerve conduction studies.

• The doctor will perform a complete physical examination, which includes testing sensitivity to touch, vibration, reflexes, and sensitivity to temperature or pain.
• Nerve conduction studies are tests that involve measuring the speed and strength of electrical signals transmitted along the nerves. Mild electrical stimuli are applied to the peripheral nerves, and their response is evaluated to identify any delay or abnormality in impulse transmission. The test helps confirm nerve damage and determine the severity of neuropathy.
• Electromyography is another test used to evaluate the electrical activity of muscles and their ability to respond to nerve stimulation. Its role is very important in determining whether muscle weakness is caused by nerve or muscle damage and provides detailed information about the functional status of the nerves.
• Other tests that can be performed to evaluate the function of the autonomic nervous system include:

• cardiac rhythm variability is tested to determine possible abnormal fluctuations;
• blood pressure is measured when moving from a lying to a standing position to see if there is a sudden drop;
• if the patient has digestive symptoms, additional tests to evaluate the function of the gastrointestinal tract, such as gastric emptying studies, are necessary.

Although one cannot speak of complete “reversibility” of diabetic neuropathy, the progression of the disease can be slowed down and symptoms can be alleviated. Early identification of neuropathy, however, is essential for prompt action.

Diet in Diabetic Neuropathy: What Foods Are Beneficial and Which Should You Avoid?

A balanced and healthy diet is essential in managing diabetic neuropathy. The main goal is to keep blood glucose levels within normal limits and prevent inflammation that could worsen neuropathic symptoms.

Here are the foods you should always include in your diet:

• Antioxidant-rich foods: fruits and vegetables such as berries (aronia, blueberries, raspberries), spinach, broccoli, and carrots are high in antioxidants, which help reduce inflammation and protect nerve cells;
• Healthy fats: oils rich in omega-3 fatty acids, such as olive oil or fish oil, can help reduce inflammation and support nerve health;
• Fiber and complex carbohydrates: consuming fiber-rich foods, such as vegetables and whole grains, helps keep blood glucose under control and prevents major sugar fluctuations in the blood.

There are also foods to avoid in diabetic neuropathy

Avoid excessive consumption of simple sugars, saturated fats, and processed foods, which can contribute to increased blood glucose and inflammation. Also, saturated and trans fats contribute to inflammation, increase LDL (“bad”) cholesterol levels, and can worsen neuropathy symptoms. Foods rich in such fats include processed meats, fast food, fried foods, pastries made with hydrogenated fats, and whole dairy products. Processed or high-sodium foods should also be avoided. These not only increase the risk of high blood pressure but can also lead to water retention and inflammation.

Last but not least, alcohol can worsen diabetic neuropathy through various mechanisms. It can affect blood glucose control, cause direct nerve damage, and interfere with the absorption of nutrients essential for nerve function, such as vitamin B12. Even certain additives and preservatives can contribute to inflammation and oxidative stress, which are aggravating factors.

Choose fresh and minimally processed foods to reduce exposure to these substances and maintain a healthier diet.

In conclusion, diabetic neuropathy is a complex and progressive condition that can affect the quality of life of diabetic patients. However, adequate management of glucose levels, adopting a healthy lifestyle, and including beneficial foods in the diet will play an important role in preventing and alleviating the symptoms of this complication. Through a comprehensive approach and strict diabetes control, patients can enjoy a better quality of life and avoid the complications of diabetic neuropathy.

References:

https://www.niddk.nih.gov/health-information/diabetes/overview/preventing-problems/nerve-damage-diabetic-neuropathies/what-is-diabetic-neuropathy

https://www.mayoclinic.org/diseases-conditions/diabetic-neuropathy/symptoms-causes/syc-20371580

https://www.webmd.com/diabetes/diabetes-neuropathy

https://www.healthdirect.gov.au/diabetic-neuropathy

https://www.healthline.com/health/type-2-diabetes/diabetic-neuropathy

https://my.clevelandclinic.org/health/diseases/21621-diabetic-neuropathy

https://www.hopkinsmedicine.org/health/conditions-and-diseases/diabetes/diabetic-neuropathy-nerve-problems