Everyone's Talking About Ozempic — But Nobody's Talking About the Nutrients It Quietly Depletes
Everyone's Talking About Ozempic — But Nobody's Talking About the Nutrients It Quietly Depletes
Ozempic (semaglutide) has become one of the most searched health topics in recent years — and for good reason. It helps control blood sugar, reduces appetite, and has shown meaningful results for weight loss. With Singapore having one of the highest rates of type 2 diabetes in Asia, it's no surprise that more people here are either on it or curious about it.
But here's what most conversations miss: when you eat significantly less — which Ozempic is designed to make you do — you also take in significantly fewer nutrients. And some of those gaps can quietly affect your energy, your mood, your muscles, and your long-term health.
Why Ozempic Changes What You Absorb
Ozempic works by mimicking a hormone called GLP-1, which slows digestion, signals fullness, and reduces how much you want to eat. It doesn't directly "block" nutrients — but when your stomach empties more slowly and your overall food intake drops, you naturally absorb less of what your body needs.
People on Ozempic often report eating one small meal a day, skipping hawker centre lunches they used to have without thinking, or finding that even teh tarik feels like too much. That kind of appetite suppression is effective for weight management — but it comes with a nutritional cost if not managed carefully.
Vitamin B12: The First to Watch
Vitamin B12 is critical for nerve function, red blood cell production, and energy metabolism. It's found almost exclusively in animal foods — meat, fish, eggs, dairy. When you're eating far less food overall, getting adequate B12 becomes harder.
There's also an additional layer here: Ozempic slows gastric emptying, which can affect the release of a protein called intrinsic factor — the substance your gut needs to absorb B12 properly. A 2022 review published in Diabetes, Obesity and Metabolism highlighted that GLP-1 receptor agonists may reduce B12 absorption over time, especially with prolonged use.
Low B12 can show up as fatigue, brain fog, numbness in the hands or feet, or mood dips — symptoms that are easy to dismiss as "just stress from work."
Magnesium: The Quiet Workhorse
Magnesium is involved in hundreds of enzyme reactions in the body — including blood sugar regulation, muscle function, and sleep quality. It's found in leafy greens, nuts, wholegrains, and legumes. When food intake drops sharply, magnesium is often one of the first nutrients to fall short.
People with type 2 diabetes — a key group using Ozempic — already tend to have lower magnesium levels, as insulin resistance affects how the kidneys manage magnesium. Eating out frequently at hawker centres, with meals often lower in leafy vegetables, can make this gap wider.
Signs you might be running low
Muscle cramps, poor sleep, headaches, and feeling anxious or irritable are all associated with low magnesium. These are symptoms people often attribute to other causes — not a quiet nutritional shortfall.
Vitamin D: Already a Problem Before Ozempic
Singapore gets year-round sunshine, but most working adults spend long hours indoors under fluorescent lighting with minimal outdoor time — which means vitamin D deficiency is surprisingly common here. Ozempic compounds this because vitamin D is a fat-soluble vitamin, found in fatty fish, egg yolks, and fortified foods. Eat less fat, absorb less D.
Vitamin D matters for immune function, bone density, insulin sensitivity, and mood regulation. A 2021 study published in the Journal of Clinical Endocrinology and Metabolism found that people with type 2 diabetes often have significantly lower vitamin D levels than the general population — and that improving levels was linked to better metabolic outcomes.
Zinc and Iron: The Ones People Forget
Both zinc and iron require adequate dietary protein to be absorbed properly — and protein intake tends to drop when total food consumption falls. Zinc supports immune function, wound healing, and taste perception. Iron is essential for carrying oxygen in the blood.
Interestingly, some people on Ozempic report food tasting different or losing interest in meat. This may ironically reduce intake of the very foods richest in zinc and iron, creating a cycle worth being aware of.
Protein: Not a Micronutrient, But Just as Critical
Protein deserves a mention because it's the nutrient most at risk when appetite drops dramatically. Without adequate protein, the body can lose muscle mass alongside fat — a concern especially for older adults. Muscle loss also slows metabolism, making it harder to maintain results long-term.
Spreading protein intake across small, frequent meals — even snack-sized ones — can help preserve muscle while the medication does its work on appetite and blood sugar.
Explore Related Nutrients
This article is for general informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making changes to your diet, medication, or supplement routine.