These Are the 7 Worst Diet Mistakes For Weight Loss (That Can Actually Cause Weight Gain!)

Just because a food is listed as "low-fat," "no sugar," or "diet" doesn't necessarily make the product healthy, Rachel said. These foods may have fewer calories, but they often contain added preservatives, salt, and sugar to make up for the flavor. "I often find my clients not feeling satiated when eating these foods, which can hinder their weight-loss goals," Rachel said.

She recommended focusing on whole foods like fruits, vegetables, whole grains, legumes, nuts, and seeds rather than processed foods like sugary snacks and beverages.