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 type 2 diabetes common in Singapore, 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 may quietly affect your energy, your mood, your muscles, and your long-term health.
Ozempic works by mimicking a hormone called GLP-1, which slows digestion, signals fullness, and reduces how much you want to eat. Most of its nutritional impact seems to come from eating less rather than from directly "blocking" nutrients, although some changes in absorption may also be possible. Either way, when your stomach empties more slowly and your overall food intake drops, you may take in 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 is critical for nerve function, red blood cell production, and energy metabolism. It's found naturally almost only in animal foods — meat, fish, eggs, dairy — and is added to some fortified foods. When you're eating far less food overall, getting adequate B12 becomes harder.
There's also an additional layer here: some reviews of GLP-1 medicines have noted low B12 becoming more common over time with use. Research on this is limited, and it isn't yet clear whether the cause is simply eating less or something else, so it's worth keeping in mind during longer-term use.
Low B12 can show up as fatigue, trouble concentrating, numbness or tingling in the hands or feet, or mood dips — symptoms that are easy to dismiss as "just stress from work."
Magnesium is involved in hundreds of enzyme reactions in the body — including blood sugar regulation and muscle and nerve function. It's found in leafy greens, nuts, wholegrains, and legumes. When food intake drops sharply, magnesium is one of the nutrients that many people on GLP-1 medicines fall short on.
People with type 2 diabetes — a key group using Ozempic — already tend to have lower magnesium levels, as insulin resistance is linked to the kidneys losing more magnesium in urine. If you eat out often and your meals are low in leafy vegetables, that may make the gap wider.
Fatigue, weakness, muscle cramps, and tingling are associated with low magnesium, although true deficiency is uncommon in healthy people. These symptoms have many possible causes, so they are not a reliable way to tell on their own — a doctor can help work out what's going on.
Singapore gets year-round sunshine, but many working adults spend long hours indoors under fluorescent lighting with minimal outdoor time — which may mean low vitamin D is more common here than people expect. Eating less can make this worse, because vitamin D is a fat-soluble vitamin found in fatty fish, egg yolks, and fortified foods, and it is absorbed best alongside some dietary fat.
Vitamin D matters for bone health and immune function, and it plays a role in how the body handles blood sugar. Observational studies link lower vitamin D levels with type 2 diabetes, but trials have not shown that vitamin D supplements improve blood sugar control, so research here is still developing.
Both zinc and iron are found in good amounts in meat, poultry, and seafood — so when total food consumption falls, intake of both can fall too. 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 deserves a mention because it can be hard to get enough of when appetite drops dramatically. Without adequate protein, the body can lose muscle mass alongside fat — a concern especially for older adults. Muscle loss may also make it harder to maintain results long-term.
Making protein-rich foods a priority at each small meal or snack may help support muscle while the medication does its work on appetite and blood sugar.
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.
Ask Elaine how this applies to your goals and routine — free, no pressure.