If you’re trying to boost your metabolism and slim down, some of the most common items in your kitchen might be working against you. Health experts say certain everyday grocery staples—often marketed as “healthy” or convenient—can actually slow your metabolism, spike blood sugar, and contribute to weight gain over time.
From sneaky sugars to ultra-processed picks, here are 11 foods to watch out for.
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1. Flavored Yogurt
Flavored yogurt, though often marketed as a convenient and tasty snack, can be linked to a slow metabolism when laden with added sugars and artificial flavorings. The excessive sugar content in flavored yogurts can contribute to insulin resistance, potentially disrupting metabolic processes over time.
"Some flavored yogurts can be high in added sugars, which can contribute to weight gain and other health problems if consumed in excess," Lisa Richards, registered nutritionist and creator of The Candida Diet, adds.
"Furthermore, weight gain occurs when there is a calorie surplus, which means consuming more calories than the body burns through physical activity and normal metabolic processes."
Choosing healthier alternatives involves opting for plain (Greek yogurt is a great alternative), unsweetened yogurt and adding natural sweetness through fresh fruits or a drizzle of honey.
2. White Bread
White bread, often made from refined flour, can be linked to a slow metabolism when consumed excessively. This can contribute to insulin resistance over time, hindering metabolic efficiency.
Registered dietitian and nutritionist Krutika Nanavati says that "Its high glycemic index can trigger insulin spikes and promote fat storage around the abdomen." She adds that "the refining process also robs it of fiber and vital nutrients, stripping away the bran and germ components and leaving behind only the endosperm. Consequently, white bread lacks the nutritional value necessary for a balanced diet."
Exploring options like sprouted grain bread or bread made from alternative flours such as almond or quinoa can offer a nutrient-rich and metabolism-friendly choice, promoting sustained energy levels and overall metabolic health.
3. Muffins
Many store-bought muffins are loaded with refined sugars, processed flours, and unhealthy fats, regardless of their flavor variety. Whether it's blueberry, chocolate chip, or banana nut, these muffins typically contain high levels of refined carbohydrates, which can quickly spike blood sugar levels and contribute to insulin resistance over time.
"You may call them muffins, but my brain says, cake. Whether they're from a bakery or a box, traditional muffins are high in calories and fat, which could lead to belly fat over time. Some of them contain over 350 calories per muffin," Lisa Andrews, MEd, RD, LD, a registered dietitian nutritionist, warns.
4. Granola Bars
Granola bars, often touted as a healthy on-the-go snack, may not always live up to their nutritious reputation. Despite their convenience and wholesome image, many commercial granola bars are packed with refined sugars, processed grains, and hidden fats, which can impact your metabolism over time.
"Granola bars are the worst 'healthy' food for weight loss because they are full of inflammatory ingredients that prevent weight loss, including refined sugars and grains. Many food manufacturers claim that their granola bars are healthy because they contain oats, but the added ingredients in granola bars are what makes them so unhealthy," says Heather Hanks, a nutritionist at Medical Solutions Barcelona.
5. Processed Meats
Processed meats, such as sausages, bacon, and deli meats, are convenient and savory additions to many diets. However, their connection to potentially slowing down metabolism is primarily due to their high saturated fat and sodium content. These pre-packaged meats often lack the essential nutrients and protein quality that can help boost metabolism and sustain energy levels.
"Foods like hot dogs, sausages, and deli meats are often high in sodium and nitrates. These can contribute to water retention and increased blood pressure, slowing metabolism. Consider opting for lean proteins like chicken, turkey, or fish instead," says Dr. Kelvin Fernandez, M.D. and Medical Residency Advisor at Ace Med Boards.
For a metabolism-friendly diet, it's advisable to limit processed meat intake and focus on lean protein sources and whole foods rich in essential nutrients.
6. Cereals
Sugary cereals are a popular breakfast choice for many, known for their sweet and appealing taste. However, their high sugar content can have implications for metabolic health.
"Sugary cereals are one of the most unhealthy processed foods you can have. They are loaded with sugar, sodium, and refined carbohydrates," Jesse Feder, RDN, CPT at My Chrons and Colitis Team says. "These things, when eaten in high amounts and consistently, can lead to obesity, high blood pressure, diabetes, and heart disease. The highly processed and refined ingredients typically give you a jolt of energy since they are able to be digested very quickly. This then causes a crash in our blood sugar, and can slow your metabolism."
Consider choices like oatmeal, Greek yogurt with berries, whole grain or bran cereals with low added sugars and high fiber content to sustain energy levels. Chia seed pudding offers a delicious and nutrient-dense option when prepared with milk and topped with fruits or nuts, while eggs, prepared in various ways, are an excellent source of protein and essential nutrients.
7. Donuts
Donuts, while indulgently delicious, can contribute to a slow metabolism when consumed in excess due to their high sugar, unhealthy fat, and refined flour content.
Sara Chatfield, registered dietitian and nutritionist at Healthcanal, says that as we age, “our metabolism declines so consuming high calorie [foods] can easily lead to weight gain.” Donuts “contain saturated fats that can lead to inflammation and increase your risk of heart disease.” They’re also “highly processed,” and “eating highly processed foods regularly can cause weight gain and has been linked to multiple chronic diseases."
Incorporating snacks such as fresh fruit, yogurt parfaits, or homemade energy bars can satisfy sweet cravings while promoting a steadier metabolism and overall well-being.
8. Instant Noodles
Instant noodles are a popular and convenient pre-packaged food, but they are often associated with a potential impact on metabolism due to their low nutritional value and high levels of refined carbohydrates. These noodles typically lack the essential nutrients, fiber, and protein needed to support a healthy metabolic rate; plus, their high sodium content can lead to water retention.
Fernandez highlights that "instant noodles are often chosen for convenience, but they lack protein and are rich in saturated fats and simple carbohydrates. This can contribute to a slower metabolism. Swapping them with whole-grain pasta or noodles could provide more nutritional value."
To foster a healthier metabolism, it's advisable to consume instant noodles in moderation while incorporating a balanced diet rich in whole grains, lean proteins, and vegetables.
9. Potato Chips
Potato chips, a popular snack enjoyed by people of all ages, are a prime example of an empty calorie food that can contribute to a slowdown in metabolism. Despite their crispy texture and savory flavor, potato chips offer little in terms of nutritional value, containing high levels of unhealthy fats, sodium, and refined carbohydrates.
"Processed snacks like potato chips can slow down metabolism because they are high in calories, unhealthy fats, and sodium," Dr. Zeeshan Afzal, MD, explains. "These snacks can cause inflammation because the high levels of unhealthy fats and sodium can contribute to chronic inflammation in the body." It's not just your metabolism that is impacted by chips, they can also lead to weight gain.
Dr. Shara Cohen recommends "avoiding potato chips, a common pantry snack that is high in trans fats, if you want to lose belly fat. These crunchy treats are notorious for their high empty calories and low nutrient content, which can lead to overall weight gain and belly fat. We may control our appetites and encourage weight loss by substituting with healthier snacks like air-popped popcorn, roasted chickpeas, or vegetable sticks."
10. Whole Grain Crackers
While there are countless varieties of crackers on supermarket shelves, and probably in your pantry (learn about which snacks are high in unnecessary calories and destroy your metabolism!) most of them don't exactly provide the nutrients that are necessary for weight loss. Crackers like soda crackers or saltines are excessively high in sodium and offer little to no nutritional benefits. And, when it comes to whole grain crackers, they claim to be nutritious and full of healthy fiber, but Mary Sabat, a nutritionist, personal trainer, and founder of BodyDesigns by Mary, warns that they are just as bad as saltines for weight loss.
"Whole grain crackers may be made with whole grain ingredients, but they are typically processed and high in calories due to added fat and sugar," she cautions. "Many brands also contain unhealthy additives like salt and artificial flavors. Because of their high-calorie content and lack of essential nutrients, whole grain crackers can be considered empty-calorie food." Even though these crackers can help fight nausea, Sabat says that it's best not to eat this snack every day if you're trying to lose weight.
11. Trail Mix
Many commercially available trail mixes contain a mix of nuts, dried fruits, and sometimes candies or chocolate. While nuts offer beneficial nutrients, the overall calorie density of trail mix can be high, especially when combined with sugary additions. The dried fruits often contain added sugars, and the chocolate or candies contribute extra calories and refined sugars.
Andrews elaborates further and says, "Trail mix, similar to granola bars, may look innocent. However, the calorie load can be quite high between the dried fruit, nuts, and chocolate pieces in the bag. Unless the serving is portioned out, it's easy to overeat these crunchy, chewy nuggets, which can lead to weight gain."
