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Nutritionists Reveals The 5 Ultra-Processed Snacks That Could Be Slowing Down Your Metabolism After 40: String Cheese, More

September 23, 2025 by Faith Geiger

 
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After 40, your metabolism naturally starts to slow down—but what you eat can make a big difference in your metabolic health. While it’s tempting to reach for quick, convenient snacks, many of the popular ultra-processed options on grocery shelves may actually throw a wrench in your weight loss goals, especially as you reach middle age.

If you’re working towards a slimmer waistline or just want to maintain your figure over 40, knowing which snacks to avoid is key. To shed some light on a few detrimental options, we checked in with health experts and uncovered five of the worst ultra-processed snacks for your metabolism. Find all of their advice below.

1. Chocolate-dipped Granola Bars

While granola itself is often considered a nutritious option, the addition of chocolate coating can introduce refined sugars and unhealthy fats. The sweet, indulgent taste of chocolate may lead to overconsumption, as individuals may perceive these bars as a healthier treat.

"While these may be marketed as a healthy snack, they are basically candy bars in disguise. Most are high in sugar and saturated fat with little nutrition inside. They may cause weight gain in your belly if they become a staple in your pantry," Lisa Andrews, MEd, RD, LD, a registered dietitian nutritionist shares.

2. Processed Meat Snacks

Processed meat snacks, such as sausages, jerky, and other cured or smoked options, have been associated with potential impacts on metabolism and weight gain. These snacks often contain high levels of saturated fats and sodium, contributing to a less-than-ideal nutritional profile. Additionally, the high calorie content and low nutritional value of these snacks may contribute to weight gain when consumed regularly.

"Beef jerky, sausages, and hot dogs are high in unhealthy fats and additives that can contribute to weight gain, including visceral fat," Mary Sabat, a nutritionist, personal trainer, and founder of BodyDesigns by Mary, says.

The additives and preservatives used in processing further emphasize the importance of moderation and a balanced diet to support overall metabolic health and weight management. Choosing whole, unprocessed alternatives can be a healthier option for those mindful of their metabolic well-being and weight.

3. 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."

4. Breakfast Cereals

Many of us like to snack on breakfast cereals by the handful. After all, it's crunchy, sugary, and perfect for satisfying your sweet tooth. However, nutritionist Krutika Nanavati tells us that all that sugar makes cereal a poor choice for your health, especially if you want to keep your gut healthy and your waistline slim. Regularly snacking on this food is likely to result in inflammation and other issues.

"Many breakfast cereals targeted at children are high in sugar and lack nutritional value," she notes. "Consuming these regularly can lead to weight gain and increased risk of chronic diseases." Yikes!

Luckily, there are some healthy cereals out there; just be sure to check the nutrition label before adding them to your cart, and stick with low-sugar options.

5. Processed Cheese Snacks

Processed cheese snacks, like mozzarella sticks, chips with nacho cheese, and others, often contain high levels of saturated fats, sodium, and artificial additives. The excessive consumption of saturated fats can potentially impact metabolic function and lead to weight-related issues. Additionally, the high calorie density and low nutritional value of processed cheese snacks may contribute to overeating, hindering weight management efforts.

"These snacks contain processed cheese, which is high in saturated fats," Sabat explains. "Excessive saturated fat intake can contribute to inflammation and weight gain." Plus, she adds, the lack of fiber can "disrupt the gut microbiome and lead to digestive issues." Say it ain't so!

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