There are many medications out there that can interact with other medications and supplements.
But did you know that medications can also interact with the food you eat?
Metformin is no exception. If you are taking metformin, you may want to adjust your diet accordingly.
Read on to find out why and learn which foods to include in your metformin diet, and what you should not eat when taking metformin.
What is metformin?
People with type 2 diabetes cannot use insulin properly. They usually have insulin resistance or decreased insulin sensitivity. This means that they have a difficult time controlling how much sugar is in their blood. Metformin treatment increases the amount of lactate. This is the underlying compound of lactic acid in the blood.
Metformin is a diabetes drug in a class called biguanides. These are medications that prevent your liver from producing glucose. Therefore, metformin lowers the amount of glucose your body absorbs from what you eat. It also improves your body’s response to insulin.
Metformin can be used alone. You can also combine it with insulin treatment or with an oral antidiabetic medicine called sulfonylurea. Metformin is only available with a prescription from a doctor.
How does metformin work?
Metformin is a medication for type 2 diabetes. It’s also used in diabetes prevention for prediabetes. Metformin does not help in type 1 diabetes because these people cannot produce insulin from their pancreas. Patients with type 1 diabetes usually control their blood glucose with insulin injections.
Metformin is also used in the treatment of PCOS. PCOS stands for polycystic ovary syndrome. This is a hormonal condition that affects ovulation and may increase androgen production. Androgens are male hormones responsible for facial hair growth and male pattern baldness.
PCOS increases the risk of developing obesity, depression, infertility, and type 2 diabetes. Health care providers sometimes use metformin in people with polycystic ovarian syndrome who are struggling with infertility. The goal is to use metformin to improve ovulation and chances of conceiving.
In the past, metformin has also been used to help women with PCOS with bodyweight loss maintenance. This is because metformin may decrease adipose tissue mass. Metformin may also help to reduce waist circumference and help with long-term weight loss.
Metformin can also be used in the treatment of metabolic syndrome.
Foods you should avoid while taking metformin
Below are six foods you to avoid while taking metformin.
- Fats: Healthy fats are fine and you should include them as part of a healthy diet if you’re on metformin. However, you should avoid foods high in trans and saturated fats when taking metformin.
- Sodium: You should avoid having too much sodium while you’re on metformin. Keep your sodium intake under 2300 milligrams per day.
- Simple and refined carbs: Simple and refined carbs increase your blood sugar levels. Avoid simple carbs such as soda, candy, and desserts. Stay away from refined carbs such as white bread, pasta, and white rice.
- High fiber foods: Fiber can absorb certain drugs and lower their concentration in your bloodstream. If you eat large amounts of fiber, your metformin levels may decrease. Keep your fiber intake under 30 grams per day.
- Alcohol: You’ll want to avoid large amounts of alcohol since it increases your risk of developing low blood sugar and lactic acidosis. Alcohol prevents the liver from storing and releasing glucose. Since people with diabetes already struggle to manage blood glucose levels, minimizing the risk factor of alcohol consumption is worth consideration.
- Drinking alcohol with an empty stomach can cause low blood sugar. This is even more true for people taking insulin or other diabetes medications that increase insulin levels.
- Metformin increases the amount of lactate. Lactate is the underlying compound of lactic acid. This isn’t of too much concern, but research shows that too much alcohol, along with a thiamine deficiency, can lead to a buildup of lactate.
- Alcohol and metformin together can lead to too much lactic acid in the blood. This can lead to lactic acidosis, a serious condition.
- In general, drinking in moderation is safe. Safe levels are one drink per day for women and two drinks per day for men. Discuss this with your doctor, as it’s possible that abstaining from alcohol may be the best choice for you as an individual.
- Grapefruit: One study looked at the effects of grapefruit on metformin in rats. Some rats were exposed to grapefruit juice and metformin, while the others were given metformin on its own.
- Researchers found that the rats that had both grapefruit juice and metformin had a higher amount of lactic acid production than the just metformin group. They may also have more weight gain.
- Researchers postulated that grapefruit juice increased the accumulation of metformin in the liver. This then caused an increase in lactic acid production. Researchers concluded that drinking grapefruit juice might lead to a higher risk of lactic acidosis in patients taking metformin.
Foods to include in your metformin diet
Below are five foods you should include in your metformin diet.
- Complex carbohydrates: Complex carbohydrates come from vegetables, fruits, and whole grains such as brown rice and whole-grain bread. These carbs have more fiber. This makes them more difficult for the body to metabolize. This then slows the release of glucose into the bloodstream. If you are consuming complex carbs, keep an eye on your overall carb intake. This is important because carbohydrates do directly affect blood sugar levels.
- Nonstarchy vegetables: Nonstarchy vegetables can help to slow your carb metabolism. Examples of nonstarchy vegetables include broccoli and leafy greens.
- Healthy fats: You can get healthy fats from sources such as fish, nuts, and olive oil.
- Moderate fiber intake: Although lots of fiber is not recommended, moderate fiber intake can actually be helpful. This is because fiber can help to control blood glucose levels. An average intake of fiber is between 25 and 30 grams per day.
- Lean protein: Encourage the consumption of lean proteins such as turkey, fish, and tofu.
Other things to avoid while taking metformin
Fortunately, there aren’t many serious metformin drug interactions. But using some drugs while on metformin can increase the risk of lactic acidosis. If you take any of the following medications, let your healthcare provider know:
- Anticonvulsants, such as topiramate (Topamax) and zonisamide (Zonegran)
- Oral contraceptives
- Corticosteroids, such as prednisone
- Diuretics, such as acetazolamide
- Blood pressure medication, such as amlodipine (Norvasc)
- Antipsychotic drugs, such as chlorpromazine
See this list of other medications to avoid while taking metformin.
Get Your FREE Diabetes Diet Plan
- 15 foods to naturally lower blood sugar levels
- 3 day sample meal plan
- Designed exclusively by our nutritionist
Should metformin be taken with food?
If you’re taking metformin for diabetes or PCOS you may wonder whether you can take metformin without food. It is fine to take metformin on an empty stomach, but taking metformin with food is usually better tolerated and helps to reduce the stomach or bowel side effects that can occur.
Any other safety concerns?
Metformin has been associated with lactic acidosis. Although this is a rare situation, it is potentially life-threatening and therefore worth mentioning here.
Less than ten out of every 10,000 people on metformin experience lactic acidosis. You are at higher risk if you have impaired liver or kidney function. You are also at higher risk of lactic acidosis if you have congestive heart failure.
If you have ever had an allergic reaction to a medicine, you must tell your doctor this. Any other allergies to foods, preservatives, animals, or dyes are worth mentioning as well. Metformin is contraindicated if you have diabetic ketoacidosis.
Other potential side effects of metformin include the following:
- Abdominal pain
- Vitamin B12 deficiency
Of the above metformin side effects, the most common are nausea and diarrhea. These gastrointestinal symptoms happen most often if you take metformin without food.
Since metformin therapy impairs your body’s ability to absorb glucose (through its effects on the gut microbiota), you may have diarrhea after eating carbs if you are on metformin.
You need to balance your dose of metformin out with the foods you eat and the exercise you do. If you change your diet, exercise habits, or make other lifestyle interventions, you will want to test your blood sugar to ensure it doesn’t go too low. If this does happen, your health care provider will be able to help you out.
At Ben’s Natural Health, we believe that natural options are the way to go. Given the above side effects of metformin, many people prefer natural alternatives such as herbs and supplements which can treat type 2 diabetes without side effects. Talk to your healthcare provider about natural diabetes treatments to see which ones may be suitable for you.
If you’re taking metformin, foods to avoid include high fiber foods, trans and saturated fats, sodium, and simple and refined carbs. Get most of your carbs from vegetables, fruits, and whole grains.
Eat nonstarchy vegetables, healthy high fat foods, lean proteins, and a moderate amount of fiber. If you’re taking metformin, it’s worth talking with your health care provider about a metformin diet.