GLP-1 drugs are widely used for weight loss and diabetes management. However, these drugs can cause vitamin and mineral deficiencies. know.
GLP-1 receptor agonists are gaining attention as drugs for managing type 2 diabetes and obesity. Drugs such as semaglutide and tirzepatide help regulate blood sugar levels and reduce appetite, which can lead to significant weight loss. Because of their effectiveness, many patients now use these drugs as part of long-term treatment plans. However, experts warn that while GLP-1 drugs support weight management, they can also affect eating patterns and overall nutrition. When appetite decreases, a person may unintentionally take in fewer nutrients than their body needs.
According to Dr. Shyam Sundar CM, Consultant Endocrinology and Diabetes, SPARSH Hospital, maintaining balanced nutrition is an important part of safe and effective GLP-1 therapy.
What are GLP-1 drugs and how do they work?
GLP-1 receptor agonists are drugs that mimic a natural hormone called glucagon-like peptide-1, which is produced in the intestine. These drugs help regulate blood sugar levels by stimulating insulin release and decreasing glucose production in the liver.
It also slows down gastric emptying, meaning food stays in the stomach longer. This process sends signals to the brain that promote satiety and reduce hunger. Because of this appetite-suppressing effect, GLP-1 drugs are widely used in obesity treatment in conjunction with lifestyle changes such as healthy eating and physical activity.
For many people who struggle with long-term weight management, these medications can be very effective when taken under medical supervision. It is most effective when combined with structured nutritional guidance, as Dr. Sander explains.
Can GLP-1 drugs cause nutritional deficiencies?
GLP-1 drugs themselves do not directly cause nutritional deficiencies. However, it can have an indirect effect as it significantly reduces appetite.
“Many patients taking these drugs feel full quickly, leading them to eat less or skip meals altogether. Over time, reduced food intake can lead to less consumption of essential nutrients such as vitamins, minerals, and protein. If meals are not carefully planned, the body may not receive the nutrients it needs for optimal health,” says Dr. Sander.
A study published in Clinical Obesity highlighted this concern. Researchers have found that people using GLP-1 receptor agonists, such as semaglutide, liraglutide, and tirzepatide, may be at risk for micronutrient deficiencies due to appetite suppression, delayed gastric emptying, and altered nutrient absorption.
In this study, we observed that nutritional deficiencies were diagnosed in 12.7% of patients within 6 months and 22.4% within 12 months after starting GLP-1 therapy. The most common problem was vitamin D deficiency, affecting 7.5 percent at 6 months of age and 13.6 percent at 1 year.
GLP-1 for weight loss: Doctor explains how this drug works and who should take it
Nutrients that require closer monitoring
When your appetite decreases, your diet is more likely to be deficient in certain nutrients. Monitoring these nutrients is especially important during GLP-1 therapy.
- protein: Reduced food intake reduces protein consumption, which can contribute to muscle loss and fatigue.
- iron: The study found that ferritin levels were 26 to 30 percent lower in GLP-1 users than in people using other diabetes drugs, suggesting a possible iron deficiency.
- Vitamin D and calcium: More than 60 percent of participants had below recommended intakes for calcium and iron, and their vitamin D intake averaged only about 20 percent of recommended levels.
- Vitamin B12 and Thiamine: Deficiencies in these nutrients can increase over time, especially if dietary intake remains low.
These nutrients play important roles in bone health, immunity, muscle maintenance, and energy production.
How do I maintain balanced nutrition during GLP-1 therapy?
Maintaining good nutrition while taking GLP-1 drugs is possible with a proper diet plan. The goal, Dr. Sander says, is to focus on nutritious foods rather than simply eating less.
Patients should prioritize a protein-rich diet, include fruits and vegetables, and get adequate calcium, iron, and vitamins. Eating smaller, more balanced meals throughout the day can also help maintain your nutritional intake even if your appetite decreases.
It is equally important to stay hydrated and have regular medical monitoring. In some cases, your doctor may recommend nutritional counseling or supplements to prevent deficiencies.
