Skip to content

What are the side effects of eating Subway?

4 min read

According to a 2025 UCLA Health study, meals from Subway can be surprisingly high in sodium, sometimes exceeding the sodium content of meals from competitors like McDonald's. This reveals that despite its 'healthy' image, there are significant side effects of eating Subway, particularly with frequent consumption.

Quick Summary

An in-depth look at the potential health issues linked to frequent Subway consumption, focusing on high sodium levels, processed meats, refined carbs, and calorie-dense options. Explores the long-term impact on cardiovascular health, weight management, and overall nutrition.

Key Points

  • High Sodium Intake: Many Subway ingredients, like processed meats and sauces, contain excessive sodium, which can lead to high blood pressure, fluid retention, and increased risk of cardiovascular disease.

  • Processed Meats: Options like ham and salami are highly processed and have been linked to long-term health risks, including a higher risk of certain cancers.

  • Refined Carbohydrates: Breads made from refined flour can cause rapid spikes and crashes in blood sugar levels, contributing to fatigue, increased hunger, and weight gain.

  • Hidden Calories: Calorie-dense sauces (ranch, chipotle) and extra cheese or bacon can significantly increase the total calories and fat in a meal, negating healthier choices.

  • Smart Choices Matter: To minimize side effects, opt for whole-grain bread, lean proteins, and plenty of fresh vegetables, while limiting high-sodium and high-fat extras.

  • Portion Control: Choosing a 6-inch sub over a footlong and skipping calorie-heavy sides can drastically reduce overall calorie and fat consumption.

In This Article

Unpacking the 'Eat Fresh' Slogan: The Reality of Subway's Nutrition

Subway has long promoted itself as a healthy alternative to traditional fast food. However, a deeper look at its menu reveals a range of potential health concerns. While fresh vegetables are a key component, other ingredients can contribute to negative health outcomes, especially when consumed regularly. These include excessive sodium, refined carbohydrates, and processed meats. This section will explore the specific side effects linked to Subway's ingredients and how your menu choices play a critical role.

The Major Concern: Excessive Sodium Intake

One of the most immediate and significant side effects of frequent Subway consumption is excessive sodium intake. Many menu items, including processed meats, cheeses, and sauces, contain high levels of salt. For example, studies have found average Subway meals can contain a high amount of sodium, with certain footlong subs exceeding an entire day's recommended allowance.

Potential consequences of high sodium consumption:

  • High Blood Pressure (Hypertension): Consistent high sodium intake forces the heart to work harder, increasing blood pressure.
  • Cardiovascular Disease: Over time, hypertension increases the risk of heart disease and stroke.
  • Fluid Retention: High salt levels can cause bloating and puffiness, as the body retains more water.
  • Kidney Strain: The kidneys must work harder to filter out excess sodium, which can be particularly concerning for individuals with pre-existing kidney conditions.

Processed Meats and Additives

While Subway offers some lean protein options, many of its sandwich meats, like salami, ham, and pepperoni, are highly processed. Processed meats are often preserved with additives and are linked to several long-term health risks.

Common issues associated with processed meats:

  • Increased Cancer Risk: Regular consumption of processed meats is linked to a higher risk of certain cancers, particularly colorectal cancer.
  • Unhealthy Fats: Many processed meats are high in saturated fats, which can contribute to heart disease.
  • Preservatives: Additives and preservatives used to extend shelf life are not ideal for long-term health.

Refined Carbohydrates and Blood Sugar Spikes

For many, a Subway sandwich is synonymous with bread. However, options like the classic Italian or Hearty Italian breads are made with refined carbohydrates. These breads lack the fiber found in whole grains and are quickly converted to sugar in the body, causing a rapid spike in blood sugar levels.

The effect of refined carbs:

  • Blood Sugar Rollercoaster: The quick rise and fall of blood sugar can lead to feelings of fatigue and increased hunger shortly after eating.
  • Insulin Resistance: Chronic consumption of refined carbs can lead to insulin resistance, a precursor to type 2 diabetes.
  • Weight Gain: The cycle of blood sugar spikes and subsequent crashes can promote overeating and weight gain over time.

High-Calorie Condiments and Toppings

The freedom to customize a Subway sandwich is a double-edged sword. While it allows for healthier choices, it also makes it easy to add significant hidden calories and unhealthy fats. Creamy dressings like ranch and chipotle, along with extra cheese and bacon, can quickly transform a seemingly healthy meal into a calorie-dense one.

Comparison Table: Calorie-Dense vs. Healthier Options

Feature Calorie-Dense Choice Healthier Alternative
Bread 12-inch White Italian 6-inch 9-Grain Wheat
Meat Footlong Italian B.M.T. 6-inch Oven Roasted Chicken
Cheese Double Provolone No Cheese
Sauce Ranch or Chipotle Southwest Light Vinaigrette or Mustard
Veggies Few All the veggies
Extras Bacon, Oil, and Mayonnaise Extra Vegetables, Vinegar
Side Cookies and Chips Apple Slices or Water

Mindful Consumption: Making Better Choices

While the side effects are a concern, they don't mean Subway must be off-limits forever. Being mindful of your choices is key. Opt for whole-grain bread, pile on the fresh vegetables, and select lean proteins like oven-roasted chicken or turkey. Be cautious with sauces, opting for lower-calorie, lower-sodium options. Choosing a smaller portion size, like a 6-inch sub, and avoiding sugary drinks and high-fat sides can also significantly reduce the negative impact.

Conclusion

Frequent consumption of Subway meals can present genuine health risks, despite its reputation as a healthier fast-food option. The primary concerns revolve around high levels of sodium, the inclusion of processed meats, and the use of refined carbohydrates and calorie-dense condiments. These factors can contribute to weight gain, high blood pressure, and other cardiovascular issues. By understanding the nutritional pitfalls and making more informed, conscious menu choices, consumers can mitigate these negative side effects and align their Subway orders with a healthier lifestyle. The customization inherent to Subway's service can be your best tool for navigating these nutritional challenges successfully.

For more information on making healthy fast-food choices, you can consult resources like the CDC's recommendations for a balanced diet.

Frequently Asked Questions

Yes, it can. While it offers healthier options, choosing footlong subs with processed meats, high-fat cheeses, and creamy dressings can lead to a high-calorie intake that contributes to weight gain over time.

It depends on the type. While options like the 9-Grain Wheat are better, others like the Italian white bread are made with refined carbohydrates. These can cause blood sugar spikes and are less nutritious than whole-grain choices.

The high sodium content comes from a combination of processed meats, cheeses, and sauces. Many ingredients are high in salt for preservation and flavor, which can quickly add up in a single meal.

Most of Subway's traditional sandwich meats, including ham, salami, and pepperoni, are processed. However, options like Oven Roasted Chicken Breast or roasted turkey breast are less processed alternatives.

A healthier order would be a 6-inch sub on 9-Grain Wheat bread with a lean protein like oven-roasted chicken, lots of fresh vegetables, and a low-calorie, low-sodium sauce like mustard or vinegar.

Yes, many sauces and dressings at Subway, such as ranch and chipotle southwest, are high in calories and fat. These can quickly increase the overall calorie count of your meal, so it's best to use them sparingly or choose lighter options.

Yes, a sub made with refined white bread can cause a rapid spike in blood sugar due to the fast breakdown of carbohydrates. This can lead to a subsequent energy crash and potential long-term issues like insulin resistance with frequent consumption.

References

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6

Medical Disclaimer

This content is for informational purposes only and should not replace professional medical advice.