A fast-mimicking, or fasting-mimicking, diet copies fasting’s effects while allowing small portions of food.
Fasting is going without food or beverages for a certain period.
The fasting-mimicking diet is aplant-based dietthat is low in protein and carbohydrates but high in fat.

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On the first day of the fast, you will consume more calories than the remaining four days.
Non-caffeinated herbal teas are also allowed.
Some fasting-mimicking diets allow for one cup of black coffee per day.
What to Avoid
Stick to a plant-based and anti-inflammatory diet while on the fasting-mimicking diet.
These include:
Is the FMD Diet Right for You?
One of the most popular types of fasting isintermittent fasting.
Water fastingis a fast in which you do not consume anything besides water.
Juice fasting consists of consuming only fruit or vegetable juices for a few days to weeks.
Allowed foods include vegetables, fruits, and plant-based foods with healthy fats.
Foods to be avoided include animal-based products, sugary foods, and high-starch foods like pasta.
There are both potential health benefits of a fasting-mimicking diet, as well as side effects.
While generally considered safe, a fasting-mimicking diet is not appropriate for certain people.
Consult a healthcare provider before trying it.
Mattson MP, Longo VD, Harvie M.Impact of intermittent fasting on health and disease processes.Ageing Res Rev.
2017;9(377):eaai8700.
doi:10.1016/j.celrep.2019.02.019
Academy of Nutrition and Dietetics.What is intermittent fasting?
Ogodek E, Pilis, Prof. W.Is water-only fasting safe?Glob Adv Health Med.
2021;10:216495612110311. doi:10.1177/21649561211031178
National Center for Complementary and Integrative Health.Detoxes and cleanses: What you oughta know.