UK nutritionist Kayla Daniels warns against eating protein yogurts and bars and sweet muesli. These "healthy" foods may contain unhealthy thickeners and sweeteners, as well as large amounts of added sugar, she said, The Daily Mail reports.

The nutritionist noted that many perceive protein yogurts as a helper to quickly gain muscles in the gym. The risk with these products, however, is that they may contain unwanted thickeners, gums, and artificial sweeteners to improve texture and taste.

According to Daniels, artificial sweeteners should be treated with extreme caution, as their frequent use can lead to insulin resistance—the decreased sensitivity to the hormone, which is associated with the risk of developing diabetes.

The sweeteners in protein bars can negatively affect your bowel function as well.

In addition, this "healthy" remedy often uses palm oil, which is rich in saturated fat. Their excess increases the risk of increasing the amount of "bad" lipoprotein cholesterol in the body.

The nutritionist added that granola bars are marketed as a healthy snack, even though they can be surprisingly unhealthy because of their high sugar content. Many brands add considerable amounts to improve flavor and "bind" grain particles, and because of this, granola bars are nutritionally similar to pastries.