The boiled egg diet involves eating several servings of hard-boiled eggs per day.
Erin Palinski-Wade, a nutrition consultant and author of several diet books, told Newsweek: "The boiled egg diet is a low calorie, low carbohydrate diet that will promote weight loss due to a calorie deficit.
"It is a very restrictive meal plan and not likely to be sustainable long term. There are a few variations of the diet, but the general outline of the meal plan is to eat two eggs with fruit at breakfast and then eggs or another lean protein with non-starchy vegetables at the other two meals during the day."
Lean protein in the diet could include fish or chicken. Snacking is generally not permitted on the diet.
Other foods encouraged in the diet are low carb fruits such as oranges, berries, and grapefruit; fats and oils like coconut oil in small amounts; and, in some variations, low fat dairy products.
At the same time, the diet limits high carb foods such as bread, starchy vegetables like potatoes, processed foods and sugar-sweetened beverages.
One popular version of the diet is based off of a book of the same name by author Arielle Chandler.