These are the individuals a registered dietitian would advise against trying intermittent fasting:
Intermittent fasting (IF) has become a popular method for weight loss, focusing on alternating between eating and fasting to promote weight loss, improve metabolic health, and reduce inflammation. There are various patterns, such as fasting for 16 hours and eating within an eight-hour window or following a regular eating pattern for five days and then restricting calories to 500-600 for two days.
While IF can yield positive results, it also comes with risks. Pregnant individuals and those with certain chronic conditions should avoid intermittent fasting. Ana Reisdorf, MS, RD, Registered Dietitian and Founder at GLP-1 Hub, explains why she advises certain clients against IF.
For individuals in their 40s, 50s, and older, IF can pose challenges in meeting daily protein requirements, potentially leading to muscle loss. This is particularly worrisome as muscle mass naturally decreases with age, and IF can further decrease metabolic rate and increase cortisol levels over time.
Who Shouldn’t Try Intermittent Fasting
According to Reisdorf, women in menopause and perimenopause, individuals with diabetes (especially type-1), those with higher nutritional needs like athletes, and people taking GLP-1 medication are at greater risk of experiencing negative effects from IF.
“These groups have increased protein requirements, hormonal imbalances, and cannot afford to consume inadequate calories,” Reisdorf explains.
Who is More Prone to Negative Effects
Individuals commonly experience setbacks with IF, especially women who do not consume enough calories or are under significant stress.
“Many individuals do not realize they are not eating adequately while following IF until they feel fatigued, experience hair loss, muscle loss, or encounter a halt in weight loss,” Reisdorf highlights.
Mental and Behavioral Challenges Associated with Fasting
IF often leads to increased fixation on food, overeating after fasting periods, and rigid thinking patterns regarding eating habits.
“For some individuals, IF exacerbates an all-or-nothing mindset,” Reisdorf adds.
If you are interested in learning more about the benefits of GLP-1s, explore 5 Surprising Health Benefits of GLP-1 Drugs That Have Nothing to Do With Weight Loss.
Alexa Mellardo