Intermittent fasting is a helpful tool for weight loss, but Dr. Stabile warns about some common mistakes that can make it difficult to see and get the most out of your results.
Intermittent fasting (IF) is an eating pattern that focuses on when you eat rather than what you eat.
Rather than eating throughout the day, people typically cycle through periods of eating and fasting. Patterns include fasting for 12 hours overnight, fasting for 14 hours, or the more widely known 16:8 approach (16 hours fasting, 8 hours eating).
However, despite the hype, this is not a one-size-fits-all approach.
To better understand who it works for, what common mistakes people make, and how to go about it safely, we spoke to Jillian Foglesong-Stabile, M.D., FAAFP physician at DABOM. He is a family medicine physician with expertise in helping patients make practical, sustainable lifestyle changes to improve their health.
Below, Dr. Stabile details what you need to know before trying intermittent fasting, the most common mistakes people make, and how to make it work in a way that’s practical for your daily life.
Intermittent fasting can support weight loss and metabolic health in some people, but it’s not right for everyone. Dr. Stabil emphasizes that suitability is determined by overall health, medical history, and individual needs.
“Intermittent fasting (IF) is a useful approach for certain people, but it is not universally appropriate for everyone.”
In general, IF may be suitable for healthy adults who want to simplify their dietary patterns or improve metabolic markers. However, Dr. Stabile does not recommend it in the following cases:
- child or youth
- People who are pregnant or breastfeeding
- People with a history of eating disorders
- People with specific medical conditions such as diabetes who require medication management
In these cases, consistent nutritional support and medical supervision are especially important.
Women and IF
Intermittent fasting may actually be slightly different for men and women. Dr. Stabile explains, “Intermittent fasting can be different for men and women, and many women tend to do better with shorter fasting periods.”
For example, rather than starting with a 16:8 schedule (16 hours fast, 8 hours eating), some women start with a 12-hour overnight fast, finishing dinner at 8 p.m. and eating breakfast at 8 a.m., and only increase the fasting period when energy levels, sleep, and hunger cues are stable.
In clinical practice, women may be more sensitive to longer fasting periods. This may be due in part to hormonal fluctuations throughout the menstrual cycle, as well as differences in stress responses and sleep regulation.
Some women report stronger hunger signs and cravings as the fasting period is extended, and may find that longer fasting periods can have a noticeable impact on energy levels, mood stability, or sleep quality.
That said, intermittent fasting is effective for both men and women. When using it, results such as weight loss tend to be comparable between men and women, but its structure often needs to be individualized, especially for women, who may benefit from a gentler starting point and shorter fasting periods.
One of the most common mistakes people make is starting too aggressively. A gradual approach is easier to maintain and tolerate than jumping into a long fasting period.
“Start with gradually shorter fasting windows and gradually increase the time as you feel comfortable. Many people start with a 12:12 schedule and then move to 14:10 or 16:08.”
This step-by-step approach allows your body to adapt while reducing fatigue, irritability, and the potential for burnout. It also helps people build consistency, which is often more important than the exact fasting period itself.
A common misconception is that intermittent fasting simply means eating less or actively skipping meals. In fact, the focus is on meal timing rather than restrictions for their own sake.
“IF is not about extreme calorie restriction. It’s not about calorie restriction, it’s about timing.”
Dr. Stabile also emphasizes that food quality is still important during mealtimes, saying, “Make sure to prioritize high-quality foods during mealtimes.”
Without adequate nutrition, some people may experience symptoms such as:
- fatigue
- nutrient gap
- loss of muscle mass
A balanced approach that includes protein, fiber, and nutritious foods will help support your energy levels and overall health.
“Some people compensate for the fasting period by overeating or making unhealthy food choices, but this can negate the calorie deficit and health benefits,” Dr. Stabile explains.
For example, a 2022 study comparing intermittent fasting and traditional calorie restriction suggests that when total calorie intake is comparable, weight loss results are often similar.
This means that timing is not the only determining factor. Overall intake still plays an important role.
One of the most important things about intermittent fasting is to pay attention to how your body responds over time. The goal is sustainability and well-being, not just compliance.
“Listen to your body,” emphasizes Dr. Stabil.
When IF is working well, people often notice benefits such as:
- stable energy
- Improved concentration
- decreased appetite
- improves digestion
- gradual weight change
If it’s not working well, warning signs may include dizziness, headaches, irritability, lack of sleep, difficulty concentrating, obsessive thoughts about food, and decreased athletic performance.
These signals may indicate that your fasting period is too long or that intermittent fasting may not be right for you.
A strict approach to intermittent fasting can make it difficult to maintain long-term fasting. Flexibility often determines whether people stick with it or not.
“Be consistent, but also allow for flexibility,” Dr. Stabile says.
“It’s okay to adjust your fasting period from time to time to accommodate special occasions.”
Allowing leeway for social events, travel, or schedule changes can help prevent all-or-nothing thinking that can lead to burnout or abandoning your approach altogether.
Intermittent fasting is a helpful tool for some people, but it’s not inherently better than other approaches, such as traditional calorie reduction.
Its effectiveness depends on how it is applied, whether it supports proper nutrition and whether it fits into a person’s lifestyle in the long term.
As Dr. Stabile emphasizes, the most important factor is sustainability. The best approaches are those that support both health and daily life in ways that are realistic and sustainable, rather than the most extreme and restrictive.
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