Intermittent fasting (IF) is a type of eating pattern that involves alternating fasting and non-fasting periods. Intermittent fasting can take several forms, including limiting eating time every day, not eating on some days, and limiting overall calorie intake. The following are some of the most common types of IF:
Time Restricted Feeding (TRF)
This entails limiting your eating hours each day to 8-10 hours and fasting for the remaining 14-16 hours. You could, for example, eat all of your meals between 12 and 8 p.m. every day and fast overnight and in the morning.
Alternate Day Fasting (ADF)
Fasting every other day is another popular approach, with some versions allowing a limited calorie intake on fasting days.
Fasting at a 5:2 ratio
This entails restricting calorie intake to 500-600 calories on two non-consecutive days per week, while eating a normal diet on the remaining five.
There is some scientific evidence that intermittent fasting may have health benefits such as weight loss, improved metabolic health, and reduced inflammation. Here are some of the key findings from IF research:
Weight Reduction
Several studies have found that intermittent fasting (IF) can help people lose weight, especially when compared to continuous calorie restriction. According to one study of overweight adults, those who followed a TRF diet lost more weight and body fat than those who ate three meals per day, despite the fact that both groups consumed the same number of calories overall (source: https://pubmed.ncbi.nlm.nih.gov/28179226/).
Better Metabolic Health
In both animals and humans, IF has been shown to improve metabolic health markers such as blood sugar and insulin levels. One study of obese adults found that those who followed a TRF diet improved their insulin sensitivity and blood pressure significantly (source: https://pubmed.ncbi.nlm.nih.gov/28890874/).
Inflammation Reduction
Chronic inflammation is associated with a number of diseases, including heart disease and cancer. IF has been shown in some studies to reduce inflammation in the body. According to one study, overweight women who followed a TRF diet had lower levels of inflammatory markers than those who ate three meals per day (source: https://pubmed.ncbi.nlm.nih.gov/29086496/).
While there is some evidence to support the potential benefits of IF, more research is required to fully understand its effects on health. Furthermore, IF may not be suitable for everyone, particularly those with a history of disordered eating or other health issues. Before beginning any new diet or eating pattern, it’s always a good idea to consult with a healthcare professional.
Overall, scientific evidence suggests that intermittent fasting may have a number of potential health benefits, particularly in terms of weight loss and metabolic health. More research is needed, however, to fully understand its effects, and it may not be suitable for everyone.