Juice detox diets have gained popularity during the past few years as a possible way to remove toxins and get your body working better. The idea is that you replace solid foods with fruit and vegetable juice and smoothies for a few days or a week. During that time, your digestive system has a chance to rest because all your nutrients are coming from liquids. You may also lose weight.

But there are some things to look out for in a juice detox regimen.

Know that the weight loss is probably temporary.

You’ll gain the weight back when you return to your old eating habits. Even if you eat healthier than you did before the diet, just going back to solid foods will add calories. So be realistic. There’s no quick way to lose pounds and keep them off. You have to be committed to eating better in the long term.

Make sure you’re getting the right nutrients.

Mix fruits and vegetables. Add green apples or a splash of fruit juice to vegetable juice to improve the taste. Or mix blueberries in with kale. You can also add fish or flaxseed oil for omega-3 fatty acids.

Don’t attempt the juice diet if you have certain health issues.

If you have high blood pressure or diabetes, you’re at risk for fainting spells.

Be aware of your body’s limits.

Don’t plan intense workouts during the days that you’re cleansing. Your body can lose muscle mass because it’s not getting the extra nutrients it needs to produce energy for exercise.