Losing weight is a very common year-round goal. And while eating healthier foods, avoiding junk and fatty foods, and being more physically active sounds simple, the reality is much more complex. It’s frustrating when you believe you have done everything right not to see the scale budge. What could be wrong? Though the reasons can be many, the answer may also be in what you’re eating.

The biggest enemy to your diet is the overconsumption of calories, particularly from sugar, processed carbohydrates, and fried foods, according to San Antonio clinical nutritionist Sarah Treat. People are very often unaware of their exact calorie intake, and this is their biggest mistake when trying to lose weight, she explained.

Ultimately, when you’re trying to lose weight, you need a calorie deficit, says Jill Maher, a nutrition health coach in Scottsdale, Arizona. You have to burn more calories than you consume. “But you also want to avoid artificial ingredients or you may not be as successful as someone eating whole foods,” she added.

Eating a balanced diet is key, but you have to know which foods have hidden ingredients you want to avoid. Not all foods and rinks are created equal, and many of them you only think are healthy when, in reality, they wreak havoc on your body.