The 80/20 dieting principle has gained a lot of traction recently. The plan is based on two simple factors: eating healthy foods 80% of the time and being able to indulge 20% of the time. This approach to eating gives you the freedom to enjoy an event on the weekend, your co-worker’s birthday, or the occasional 3 p.m. treat, guilt-free. Learn how to successfully navigate this diet with these quick and easy starter steps.

More: Quiz: What Dr. Oz Diet Should You Try?

Be Careful of Overestimating

You cannot estimate the quantity of 20% of your diet versus 80%. Trying to do so will most likely cause an overestimation of how many calories you should eat and what proper portion sizes are. Instead, do the math and find out exactly how many calories you have to eat in order to lose weight and then split that number into an 80/20 ratio.

More: Calculate How Many Calories You Should Be Eating