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Iron deficiency and anemia are more common after a gastric bypass than after a sleeve gastrectomy or an adjustable gastric band. This is especially true in women. In fact, iron deficiency can occur in more than half of women who are past menopause when they have this surgery.
Iron deficiency is a side effect that results from the changes made during the surgery. Most of the iron from foods such as meats, legumes, and iron-fortified grains is absorbed in the first part of your small intestine (duodenum). But after a gastric bypass procedure, food bypasses the duodenum. This can lead to iron deficiency and other nutrition problems.
The amount of iron in a standard multivitamin (18 mg) may not be enough to prevent anemia if you have this kind of surgery. You will need to take more iron if you are iron deficient after a gastric bypass.
Iron deficiency is more common in women who have this surgery after menopause. It can occur in more than half of women in this age group. Men who have had gastric bypass also may develop iron deficiency. But this side effect happens much less often in men.
Iron has many important roles in your body. It’s important for the health of your hair, skin, and nails. It also helps make hemoglobin. This is the substance inside red blood cells that carries oxygen throughout your body. When you are anemic because of iron deficiency, you may have:
Your healthcare provider will note any of the above symptoms. He or she will also order blood tests to find out if you have iron deficiency or anemia. In its early stages, iron deficiency begins to use up the stores of iron in your body. This can be seen by testing your levels of ferritin. Ferritin is a protein that stores iron in your body. If your ferritin levels are low, your iron is likely low.
If your iron deficiency has turned into iron deficiency anemia, you will need a complete blood count test to find any other problems. These might include low hemoglobin, lower numbers of red blood cells, and smaller red blood cell size.
For men, or for women past menopause, iron deficiency anemia might not be related to the gastric bypass surgery. Your healthcare provider will need to be certain that you are not anemic from blood loss elsewhere, such as from your intestine. You may need a colonoscopy to look for a source of blood loss from your large intestine.
Many people can raise their iron levels by making some changes to their diet. If your iron deficiency is related to a gastric bypass procedure, your healthcare team probably will prescribe iron supplements. This extra iron should come from a prescription from your provider, not from an over-the-counter (OTC) supplement you pick yourself. The exception to this is if your healthcare provider recommends a certain OTC iron product for you. Your provider may recommend a certain type of iron that you could absorb better after a gastric bypass.
If you are a teen boy or girl, or a woman of childbearing age, you may need 2 multivitamins plus 50 mg to 100 mg of iron each day. You may also need a vitamin C supplement or other supplements to help your body absorb more iron. Your healthcare provider will tell you the right amount of iron that you need.
Iron supplement can cause side effects. Many people have constipation and nausea.
For some people, supplements aren’t enough. This is usually true for women with heavy menstrual periods. You may need iron through an IV (intravenous) line or blood transfusion. Or you may need more surgery on your bypass to increase the amount of iron you absorb.
You should have a blood tests before weight-loss surgery to find out if you have any vitamin or mineral deficiencies. These might be low levels of iron, vitamin B-12, or folate. Getting treatment for these deficiencies before your surgery will help your quality of life after surgery.
After gastric bypass surgery, you will need to monitor your level of iron and other nutrients for the rest of your life. You can develop iron deficiency and anemia years or decades after your gastric bypass surgery. Your healthcare provider should measure your iron levels 6 months after weight-loss surgery and at least once a year after that. You should also have a complete blood count test.
Red meat, poultry, seafood, leafy greens, legumes, iron-fortified grains, and other iron-fortified foods are all good sources of iron. Drinking more than 2 to 3 cups of milk a day may decrease how much iron you absorb. But dietary changes alone may not be enough to prevent or fix an iron deficiency related to a gastric bypass procedure. Work with your healthcare provider to find the right iron supplement plan for you.
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