What Is Type 3 Diabetes? Insulin Resistance In The Brain That Could Trigger Alzheimer’s
Most people are aware of type 1 and type 2 diabetes, but did you know there is a type 3 diabetes as well! It is a more obscure term. Although it is not an accepted medical diagnosis, type 3 diabetes has been discussed in the literature as a possible relationship between insulin resistance in the brain and Alzheimer's disease. This link has been described to help explain how metabolic disorders impact brain health, causing cognitive decline and dementia.
Type 3 diabetes is more of a misnomer because it should not be confused with type 3c diabetes, which relates to pancreatic dysfunction. The term "type 3 diabetes," on the other hand, has been loosely used by some scientists to analogously propose that Alzheimer's disease is strongly implicated with insulin resistance in the brain.
This concept was conceptualized by Dr. Suzanne de la Monte and Dr. Jack Wands of Brown University in the year 2008. This hypothesis postulated that Alzheimer's disease may be called type 3 diabetes for it bears many similarities with glucose metabolism disorder type 2 diabetes. Their concept arises from the basic principle that insulin is fundamental to blood sugar regulation, but it is also the case with the brain. When brain cells become insulin-resistant, they lose access to glucose, impairing their function.
Research published in the Journal of Diabetes Science and Technology supports this hypothesis by indicating that insulin resistance can be a significant contributor to the occurrence of dementia, also referred to as Alzheimer's. The symptoms of memory loss and diminished reasoning are associated with impaired glucose metabolism in the body, especially in the cerebral tissue.
Although type 3 diabetes is not a "medical term," its symptoms correlate well with Alzheimer's diseases that are known to reduce the ability to think in an efficient manner and bring down brain health. These signs are:
- Loss of memory, especially short-term.
- Poor judgment and judgment ability
- Failure in recognizing people or places familiar once.
- Failure in the process of reading, writing or processing numbers
- Anxiety, agitation, or mood changes.
- Disorganized thoughts or confusion
- Lack of impulse control
As the disease advances, patients may be afflicted with severe complications including an inability to swallow or control their bodily functions. In the final stages, most patients die from fatal complications such as aspiration pneumonia.
This may not be well understood with regards to type 3 diabetes, or the exact link between insulin resistance and Alzheimer's disease. Some identified contributing factors include the following:
Insulin acts as an important regulatory mechanism of brain functions such as memory and cognition. The reduction in insulin signaling may impair metabolism of brain cells, thus bringing about neurodegeneration.
These diseases show a strong relationship and those individuals diagnosed with type 2 diabetes have double chances of getting Alzheimer's. In the two, the main causes can be chronic inflammation, oxidative stress, and a defect in glucose metabolism.
Insulin resistance associated with obesity, stress, and an unhealthy diet is considered a cause that may increase the chances of Alzheimer's disease.
Researches in Frontiers in Neuroscience and The Lancet Neurology have also highlighted that drugs used for antidiabetic medication may be crucial for the prevention or at least slowing down the course of Alzheimer's.
In 2022, in a study in Pharmaceuticals, researchers studied biomarker uptake in brain regions implicated in the faulty uptake and metabolism of blood sugar in Alzheimer’s patients.
Emerging Therapies
Research into such treatments as intranasal insulin has also been promising. Intranasal delivery of insulin directly to the brain has been reported to enhance glucose uptake by brain cells, improve memory, and boost cognitive performance. While such clinical trials have been shown to be successful, additional research is needed for safety and efficacy.
Medications
For patients being aggressive or agitated, antipsychotic drugs may be prescribed; however, therapies such as cognitive rehabilitation as well as cognitive stimulation therapy serve to preserve memory and executive function.
Lifestyle Interventions
Diet, exercise, and stress management are critical in preventing and managing insulin resistance. A review in the Journal of Alzheimer's Disease also highlighted the benefits of Kirtan Kriya meditation, which can regulate genes involved in insulin and glucose metabolism, improve sleep, and reduce inflammation.
Although type 3 diabetes is not officially recognized, its connection to Alzheimer’s disease underscores the importance of proactive measures for brain health. Some prevention strategies include:
1. Healthy Diet
Consuming a balanced diet rich in antioxidants, whole grains, and healthy fats may support brain health.
2. Regular Exercise
Physical activity improves insulin sensitivity, reduces inflammation, and enhances overall metabolic health.
3. Stress Reduction
Mindfulness practices, including meditation, have been shown to lower stress levels, which can reduce the risk of cognitive decline.
The term type 3 diabetes brings out the complex relationship between metabolic disorders and brain health. Even though it is not a recognized medical condition, the concept emphasizes the crucial role of insulin in brain function and its possible contribution to Alzheimer's disease. Continued research will hopefully provide hope for therapies such as intranasal insulin and lifestyle modifications.
Credit: iStock
Glucagon-like peptide-1 (GLP-1) receptor agonists, such as Ozempic and Mounjaro, are best known for treating type 2 diabetes and obesity. However, a new study published in The BMJ suggests that people with diabetes using these blockbuster drugs may have an increased risk of hair loss (alopecia).
While the absolute risk is low, researchers from the University of Pennsylvania and the University of Southern California identified alopecia as a possible side effect of GLP-1 receptor agonists, particularly semaglutide and tirzepatide.
“GLP-1 receptor agonist use was associated with a higher risk of clinically recorded alopecia, particularly non-scarring alopecia, in patients with type 2 diabetes, compared with SGLT-2 and DPP-4 inhibitors,” the researchers wrote.
Non-scarring alopecia is a type of hair loss in which the hair follicles remain intact, making hair regrowth possible.
The researchers said the findings could help inform shared decision-making when considering GLP-1 receptor agonist therapy and highlight the need for further research into dermatological outcomes.
Researchers analyzed health data from 12,004 patients using GLP-1 receptor agonists and compared them with 15,221 patients using SGLT-2 inhibitors between January 2019 and September 2024. They also compared another 11,964 GLP-1 receptor agonist users with 11,233 DPP-4 inhibitor users.
The study found that adults using GLP-1 receptor agonists had:
Further analyses showed the association was specific to non-scarring alopecia, with a 53% higher risk compared with SGLT-2 inhibitors and a 72% higher risk compared with DPP-4 inhibitors.
The researchers noted that rapid weight loss is a well-established trigger of hair shedding and may also lead to iron or zinc deficiencies, disrupting the hair growth cycle.
They added that hormonal changes may also play a role, although further studies are needed to understand the underlying mechanisms.
The researchers acknowledged that they could not assess the severity, extent, duration, or reversibility of alopecia after treatment was stopped because of limited clinical information. They also could not rule out the influence of other unmeasured factors.
However, they said the study was based on high-quality data from a large, representative cohort, and the findings remained consistent across additional analyses.
“Our findings extend previous anecdotal safety signals and provide more systematic evidence to inform clinical awareness of this potential adverse effect,” the researchers concluded.
If you're experiencing excessive hair shedding while taking semaglutide, you may consider:
Credit: iStock
Between climbing the career ladder, raising kids, and keeping everything else running smoothly, there's rarely a spare moment when women should stop and check in with their own bodies.
Yet these same demanding years are often when certain autoimmune and chronic conditions first start to surface. The early signs tend to be so mild and easy to explain away that most women simply put them down to stress, lack of sleep, or an overly full plate.
Some of the autoimmune conditions that commonly fly under the radar include:
· Lupus
· Rheumatoid arthritis
· Sjogren’s syndrome
· Systemic sclerosis
· Psoriatic arthritis
Family history matters more than most women realize. Autoimmune conditions often have a genetic component, and having a parent, sibling, or close relative with an autoimmune disorder meaningfully raises the likelihood of developing one yourself, even if the specific condition isn't identical. If this applies to a woman, the symptoms below deserve even closer attention and a lower threshold for seeking medical advice, rather than waiting to see if they resolve on their own.
So, when should women get it checked? If any of these symptoms stick around rather than passing after a good night's sleep, it's worth paying attention:
· Fatigue that doesn't go away no matter how much rest you get
· Joint pain or stiffness, especially in the morning
· Unexplained aches in your muscles
· Skin rashes or a new sensitivity to sunlight
· Sudden shifts in your weight or energy levels
It is advised not to dismiss them, particularly if they've been going on for a few weeks. Early detection changes everything. It is observed that the difference between a manageable condition and a complicated one often comes down to how soon it was caught.
Diagnose early, and treatment can be initiated before the disease has a chance to progress, allowing a patient to continue living life on her own terms, not one dictated by illness.
That said, the fundamentals of good health have never changed, and we continue to emphasize routine check-ups, a balanced diet, adequate sleep, regular physical activity, and sound stress management. But if there is one thing every woman should take seriously, it is to learn to listen to your own body.
You know it better than anyone else. If something feels different, do not dismiss it or wait it out; seek an opinion. Awareness combined with timely action is what ultimately allows a woman to lead a full, active life both professionally and personally, well into her later years.
(Dr. Chirag Rajkumar Kopp, Consultant - Rheumatology & Clinical Immunology, Ramaiah Memorial Hospital, Bengaluru)
Credit: iStock/Instagram
In June, X-Men actor and former professional wrestler Tyler Mane revealed that he had been diagnosed with a "super-rare" form of breast cancer. The disease is uncommon in men, accounting for only about 1% of all breast cancer cases.
Now, as he undergoes treatment, the actor is encouraging men to pay attention to their health, have open conversations about family medical history, and never ignore unusual symptoms.
As he lost weight, he noticed a lump in his breast. Initially, he did not think it was serious and had it removed. However, laboratory tests revealed it was invasive ductal carcinoma, the most common form of breast cancer.
Following the diagnosis, Mane underwent genetic testing, where he found that he carries the BRCA2 gene mutation. The mutation significantly increases the risk of developing several cancers, including breast, prostate, pancreatic and, in women, ovarian cancer.
The discovery also made him realize how little he had discussed health issues with the men in his family.
Although the cancer was caught early, doctors determined it was aggressive enough to require chemotherapy after surgery.
"I was lucky enough that my breast cancer was stage 1. Men usually don't notice the signs or don't quickly treat breast cancer. By the time it's diagnosed, it is often stage 3 or 4, metastasized throughout their bodies, and then it becomes a whole different thing," he wrote in an interview with Yahoo.
Mane explained that the tumor measured 28 millimeters and had a surgical margin of less than one millimeter, making additional treatment like chemotherapy and radiation necessary.
The actor added that genomic testing showed a high risk of recurrence without treatment.
Mane is currently undergoing four rounds of chemotherapy followed by localized radiation therapy.
"I'm being treated with four rounds of chemo, and then I have to have some localized radiation treatment to make sure the cancer is all wiped out."
While treatment has been challenging, he said it is essential. "And let me tell you: Chemotherapy is not fun. But it is a necessity."
He also describing its side effects such as 'metal taste' hair loss and fatigue.
"They give you some really good steroids for the day before, the day of and the day after chemotherapy. But then when that wears off, it all kind of hits you. You get the metal taste in your mouth. You feel sluggish and want to sleep all the time. My beard fell out. I look like a hairless cat with a couple of tufts on my face now".
The actor admitted he initially underestimated the impact chemotherapy would have on his body. He also realized he had pushed himself too hard physically in an effort to stay strong.
Now, he is focusing on maintaining his strength by increasing his protein intake while continuing moderate exercise.
"Physically, I'm trying to keep up my protein intake to help me stay strong throughout treatment."
Despite the challenges, Mane has continued a daily workout routine that includes push-ups, squats and rebounding exercises.
Through his public updates and the podcast Mane hopes to raise awareness that breast cancer is not exclusively a women's disease. By sharing his experience, he wants more men to recognize the symptoms early, discuss their family medical history, and seek medical attention without delay.
© 2024 Bennett, Coleman & Company Limited