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Why Am I Not Losing Weight with Intermittent Fasting?

As a certified diet coach with over 10 years of experience helping people manage their health and wellness, I have seen first-hand how intermittent fasting (IF) can be an effective weight loss strategy when done correctly. But often times people find themselves confused as to why the pounds aren’t falling off as quickly as they hoped they would when following an IF plan. As someone who has helped countless clients optimize their fasting practices over the years, let me share with you my top reasons for why intermittent fasting may not be working as intended, along with actionable solutions you can implement right away.

Not Giving It Enough Timeperson looking at silver-colored analog watch

While impatience is understandable, weight loss takes time—even with IF. Just as it took time to put weight on, it will take time to safely and sustainably take it off. Most people see results within 4-10 weeks when consistently following an IF plan that meets their individual needs. Remember, slow and steady wins this race! Stick with your plan for at least 6 weeks before making changes.

Eating Too Many Calories During Your Windowperson holding cheese burger

IF restricts “when” you eat, not “what” or “how much.” So overeating can easily happen if you’re not mindful. Download a calorie-tracking app and diligently log everything for 1-2 weeks. You’ll be surprised what sneaky calories are lurking. Aim for a 10-20% calorie deficit for healthy weight loss of 1-2 pounds per week.

Skipping Critical Macros Like Proteinprotein shaker gym

Protein is key for feeling full and preserving metabolism-boosting muscle mass. Aim for moderate protein with every meal—0.5-1 grams of protein per pound of body weight daily is a good target. It is generally recommended for adults who are working out on a regular basis that they consume around 30-40 grams of protein per meal. Focus on high-quality protein sources like chicken, fish, eggs, legumes and dairy or protein powder if needed.

Choosing the Wrong Fasting Protocolalarm clock, cup, morning

Not all IF plans are a good fit for everyone. Consider whether a longer (16:8 or 18:6), or a time-restricted (12-10 PM) eating window better suits your schedule and lifestyle. Experiment until you find your “fasting sweet spot” for optimal compliance and results.

Not Drinking Enough Water

Proper hydration supports fat loss in multiple ways. Water supports fullness and reduced calorie intake: Consuming water with or between meals can temporarily suppress appetite since it takes up space in the stomach. This makes it easier to avoid overeating, consume fewer overall calories, and stay in a calorie deficit for fat loss. Sip on water or herbal tea throughout the day, especially during fasts. Gradually work up to half your body weight in ounces daily. This small change can go a long way!

Inadequate Sleep

Most adults need 7-9 hours nightly for hormonal and metabolic function. Bad sleep undermines willpower and leads to poor dietary choices. Establish a relaxing bedtime routine optimized for quality rest.

Filling Up on Processed Carbs

Refined carbs spike blood sugar and insulin, pushing your body into fat storage mode. Emphasize whole, high-fiber carb choices like starchy veggies, beans, lentils, nuts and seeds. Limit added sugar and baked goods as much as possible.


While activity supports health, too much exercise without recovery can induce stress and cortisol release—the opposite of what’s needed to lose fat. Focus on moderate exercise 4-5 times weekly, alternating intense sessions with low-impact recovery work.

Breaking Fast Too Earlyfruit sandwich on a blue ceramic plate

Give your body adequate time in fat-burning ketosis—at least 16-18 hours—to reap IF’s full benefits. Slowly increase your fasting window as your body adapts to push through plateaus.

Lacking Accountabilitya clock surrounded by vegetables and a knife

Habit change is tough, so seek support where you can get it. Connect with an IF community, hire a trainer or dietitian, or find a workout/fasting buddy. Accountability through friendly check-ins keeps you focused on your goals.

If several weeks have passed following the above strategies consistently and you still find yourself perplexed as to why the scale isn’t budging, it may be time to consult your doctor. Factors like thyroid issues, menstruation changes or other underlying conditions could be impeding progress. Don’t lose hope—with patience and fine-tuning, IF can absolutely help you achieve your weight goals when done right for you. I hope these tips provide some clarity and get your fasting journey back on the right track towards sustainable success!

Frequently Asked Questions

1. Why my weight is not decreasing after intermittent fasting?

There can be several reasons why you may not see the scale budge after following intermittent fasting (IF) for some time. Common factors include eating too many calories during your eating window, not giving your body enough time to adjust (usually 4-6 weeks), lack of sleep, excessive exercise, not staying hydrated, or choosing the wrong IF plan for your schedule and lifestyle preferences. Analyzing your food log compared to your calorie needs and tweaking your routine as needed is often all that’s required to break through a plateau. Be patient – weight loss takes time, even with IF.

2. Why do some people not lose weight with intermittent fasting?

While IF can certainly support weight loss when done correctly, individual results may vary based on factors like starting weight, eating habits, activity levels, fasting consistency, stress management, and underlying health conditions. Some may overeat calories during their eating windows, not fast long enough, lack accountability, or chose the wrong plan for their lifestyle. Taking a hard look at existing behaviors and optimizing other health areas is usually what’s needed to see IF work as effectively as possible for weight loss.

3. How can I speed up weight loss on intermittent fasting?

Minor tweaks like decreasing your calorie intake by 100-200 calories daily, adding a bit more activity, extending your fasting window in increments of 1-2 hours, committing to 8+ hours of sleep nightly, switching from processed carbs to whole sources, and staying well-hydrated throughout the day can all help rev up your fat-loss results with IF. Tracking macros is also advisable to ensure adequate protein intake for muscle retention while in a calorie deficit for faster, more sustainable weight shedding.

4. How long should it take to see weight loss from intermittent fasting?

Most people see initial weight loss within the first 1-2 months when fasting consistently and properly. A safe, healthy rate of loss using IF is 1-2 pounds per week on average. Noticeable losses may slow after the first 6-12 weeks as your body adapts to the new routine. Stick with your IF protocol for a full 2-3 months – any fluctuations before then are likely just water weight changes. Staying patient and not expecting overnight transformations are key.

5. What is the best intermittent fasting window to lose belly fat?

While 16:8 works well for many, some find a longer overnight fast between 16-20 hours triggers deeper ketosis, which has been shown to specifically burn more visceral belly fat. A few options that may produce results include a 16:8, 18:6, or 20:4 plan—fasting from dinner until lunch the next day. Extended fasts of 24-48 hours 1-2 times monthly can also help cut abdominal fat, especially when coupled with strength training focused on core muscles. Consistency is still crucial for lasting changes in stubborn belly fat.

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