Obesity and Type 2 Diabetes: Inseparable Companions
When people talk about type 2 diabetes, excess weight is almost always mentioned alongside it—and for good reason. The connection between these two conditions is so strong that doctors often use the term “diabetes of the obese” (although this is not entirely accurate, since people with normal weight can also develop the disease, but the statistics are compelling).
Short answer: obesity is not just a common companion, but one of the main causes of type 2 diabetes. While in type 1 diabetes the pancreas simply does not produce insulin, in type 2 diabetes—especially against the background of obesity—insulin resistance develops, meaning the cells lose their sensitivity to insulin.
How Does Obesity Lead to Diabetes?
Imagine a lock (your body’s cell) and a key (insulin) that must open the door to let glucose (sugar)—the main source of energy—inside.
1. Overeating and excess fat
When a person consumes more calories than they burn, the excess is stored as fat. But fat is not just a passive storage depot. Adipose tissue (especially visceral fat, which surrounds internal organs) becomes an active endocrine organ.
2. Release of substances
This internal fat releases various substances into the bloodstream—pro-inflammatory cytokines and free fatty acids. These literally “clog” the cells and make their membranes more rigid.
3. The lock breaks
Insulin approaches the cell (knocks on the door), but the cell “doesn’t hear” it and does not open. Glucose remains in the blood, while the cells starve. This condition is called insulin resistance.
4. Pancreatic overwork
Seeing that blood sugar remains high, the pancreas starts producing even more insulin, trying to “get through” to the cells. After years of overwork, it becomes exhausted. At some point, its capacity declines, insulin production drops, and blood sugar finally goes out of control—this is when overt type 2 diabetes develops.
The Vicious Cycle: Obesity Worsens Diabetes, Diabetes Worsens Obesity
This is a closed loop that is difficult—but essential—to break.
- Insulin is a storage hormone
With insulin resistance, insulin levels in the blood are chronically elevated (hyperinsulinemia). Insulin promotes fat storage and blocks its breakdown. The higher the insulin level, the harder it is to lose weight. - Fatigue and reduced activity
High blood sugar causes weakness, fatigue, thirst, and frequent urination. A person moves less, burns fewer calories—and weight continues to increase. - Medications
Some glucose-lowering drugs (such as insulin or sulfonylureas) can contribute to weight gain, further complicating the situation.
Why Is Visceral Fat So Dangerous?
For diabetes, it is not so much subcutaneous fat (folds on the abdomen and sides) that is dangerous, but visceral fat—deep fat surrounding the liver, pancreas, and intestines.
- It can be suspected by waist circumference: more than 94 cm in men and more than 80 cm in women is a warning sign.
- Visceral fat is metabolically active. It releases fatty acids directly into the portal vein leading to the liver, causing fatty liver disease and further worsening insulin resistance.
Weight Loss as Treatment
The good news is that type 2 diabetes is a condition that can be controlled—and in some cases even brought into long-term remission—primarily through weight loss.
Studies (such as the well-known DiRECT trial) have shown that losing 10–15% of initial body weight can have remarkable effects:
- Fat disappears from the liver and pancreas
As fat decreases in these organs, they begin to function normally again. - Insulin sensitivity returns
Cells start to “hear” insulin again. - Blood sugar decreases
Glucose levels normalize, and many patients can discontinue medications (strictly under medical supervision!).
How to Lose Weight Properly with Type 2 Diabetes?
Standard diets are often less effective here. A systematic approach is required.
1. Calorie deficit without starvation
Severe fasting is dangerous—it can cause hypoglycemia. A moderate deficit (300–500 kcal per day) is optimal. The diet should be based on:
- Lean proteins (fish, poultry, cottage cheese, eggs)
- Vegetables (except large amounts of potatoes and beets)
- Low glycemic index foods (barley, buckwheat, legumes)
- Healthy fats (vegetable oils, nuts, avocado, fatty fish)
2. Physical activity
It works in two ways:
- Burns calories (helps reduce fat)
- Increases insulin sensitivity (muscles take up glucose during activity without insulin)
At least 150 minutes of moderate exercise per week (walking, swimming, cycling) is sufficient.
3. Medication support
Modern treatments for type 2 diabetes not only lower blood sugar but also promote weight loss (such as metformin, GLP-1 receptor agonists, and SGLT2 inhibitors). It is important to discuss with your doctor which therapy is right for you.
4. Surgical methods
In cases of severe obesity (BMI > 35–40), when diet and medications are ineffective, bariatric surgery (gastric bypass, sleeve gastrectomy) may be considered. These procedures often lead to remission of type 2 diabetes.
Psychological Aspect
It is important to remember that food often serves not only to satisfy hunger but also to provide comfort. Diabetes and obesity frequently go hand in hand with anxiety and depression. Working with a psychologist or joining support groups can be an essential part of treatment.
Weight loss is a marathon, not a sprint. It is important to acknowledge and celebrate every step forward, even small ones.
Conclusion
Obesity and type 2 diabetes are two sides of the same coin. Visceral fat is the main enemy—it makes cells “deaf” to insulin and damages the pancreas.
But there is an optimistic ending to this story. Targeted and gradual weight loss is the most powerful tool in the fight against diabetes. Losing even 5–10% of body weight can significantly improve blood sugar control, reduce medication needs, and restore quality of life.
The key is to act consistently, under medical supervision, and with confidence in success.