Can celery break your fast?

Intermittent fasting has become an increasingly popular way to lose weight, improve health, and simplify meal planning. Many people follow the 16:8 method, where you fast for 16 hours per day and eat during an 8-hour window. But an important question arises – can you eat certain very low-calorie foods like celery during the fasting period without breaking your fast?

What is Intermittent Fasting?

Intermittent fasting (IF) is an eating pattern that involves regular fasting periods. The most common IF method is the 16:8 plan, where you fast for 16 hours per day and restrict eating to an 8-hour window. So for example, you might skip breakfast and eat between 12pm-8pm daily. Some people fast for longer periods, such as 20 hours per day.

During the fasting window, you can consume zero-calorie beverages like water, black coffee, and tea. The purpose of intermittent fasting is to allow the body to enter a metabolic state called ketosis, where it starts burning fat for fuel. This can lead to weight loss and other health benefits.

Does Eating Celery Break Your Fast?

Celery is very low in calories and carbs. There are only 6 calories in a medium stalk of celery. It has a high water content and is rich in vitamins, minerals, and antioxidants. Many people believe celery is safe to eat during a fast since it’s so low in calories. But experts are divided on whether celery truly keeps you in a fasted state.

Here are the key considerations:

  • Celery does contain some carbohydrates. A stalk of celery has around 1.6 grams of carbs. During a fast, experts recommend keeping carbs under 50 calories or 25 grams per day.
  • Even though it’s low-calorie, celery provides stimulation to the digestive tract. Eating stimulates gut hormones and enzymes which influence metabolism.
  • Some studies show that anything under 50 calories is unlikely to trigger insulin secretion or break ketosis. Celery is well below this threshold.
  • Animal studies suggest the fiber in celery may actually increase satiety hormones and support fat burning during fasting periods.

Overall, evidence on both sides suggests celery is unlikely to negate the benefits of intermittent fasting for most people. But opinions still vary.

Tips for Incorporating Celery into a Fast

Here are some tips on how to consume celery during a fasted state:

  • Keep portions small – stick to 1-2 low-calorie stalks max at a time
  • Minimize other carb sources – celery carbs can add up fast
  • Wait at least 4 hours into your fast before consuming celery
  • Drink plenty of water to stay hydrated
  • Pay attention to your body’s signals – if you feel hungrier, avoid celery

Health Benefits of Celery

Celery is an extremely healthy, hydrating food. Here are some of its top benefits:

  • Hydration – Celery is 95% water, making it very hydrating.
  • Vitamin K – One stalk has about 10% of your daily vitamin K needs.
  • Antioxidants – Rich in antioxidants like luteolin that reduce inflammation.
  • Fiber – Contains insoluble fiber that relieves constipation.
  • Nutrients – Good source of folate, potassium, vitamin B2 and B6.

Celery’s high nutrient content provides added benefits when eaten during a fast. Its fiber content helps promote fullness and gut health. The water content also prevents dehydration during fasting periods.

Is Celery Keto-Friendly?

The keto diet involves limiting carbs to enter ketosis. Celery is very low in carbs and calories, so it can definitely fit into a keto eating plan. Here are some points about celery and keto:

  • One medium stalk of celery has 1-2 total grams of net carbs.
  • Celery is low in sugar – it has zero added sugars.
  • It has a very low glycemic index, meaning it won’t significantly impact blood sugar.
  • Celery is high in fiber, which slows digestion of the few carbs it does contain.

When consumed in moderation, celery provides hydration and nutrients without disrupting ketosis. But be mindful of portions – excessive intake could potentially knock you out of ketosis due to the carbs building up.

Other Fast-Friendly Low-Calorie Foods Like Celery

Here are some other very low-calorie foods that may not technically break a fast:

Food Calories per serving
Celery 6-10 calories per stalk
Cucumbers 5 calories per 1⁄2 cup sliced
Broccoli 31 calories per cup
Bell peppers 20 calories per pepper
Carrots 25 calories per 1⁄2 cup sliced
Cauliflower 22 calories per 1⁄2 cup
Zucchini 18 calories per 1⁄2 cup sliced

Combining these low-calorie vegetables can add volume and nutrients without significant calories or carbs. Portion sizes still matter, even for these foods.

Potential Downsides of Eating During a Fast

Even though celery and some other foods are very low in calories, eating anything at all during your fasting window can have drawbacks including:

  • Digestive stimulation – Eating triggers the release of hormones, bile, and enzymes. This technically breaks the true fasted state.
  • Larger appetite – Eating small amounts may make you feel hungrier later on.
  • Blood sugar effects – Carbs from celery and other foods may impact ketosis and blood sugar.
  • Reduced autophagy – Animal studies show autophagy peaks between hours 16-24 of fasting. Eating may reduce these cellular cleansing effects.

If your goal is fat burning or detox, avoiding ALL foods and calories during your entire fasting window may provide superior benefits. But this level of strict fasting can be challenging to maintain.

Should You Avoid Eating Celery While Fasting?

At the end of the day, whether or not to eat celery while fasting comes down to your personal preferences, goals, and body responses. Here are some final recommendations on celery consumption during intermittent fasting:

  • Avoid celery if you want a complete fast with zero stimulation of digestion.
  • Consume celery in small portions if you want some flavor and hydration without significantly impacting ketosis.
  • Wait at least 4-6 hours into your fast before having celery.
  • Track your results eating celery vs. fasting without it – note hunger, energy, weight changes.
  • Increase celery intake if you feel it provides benefits and doesn’t increase hunger.
  • Stop celery intake if you feel hungrier or negatively impacted.

Pay close attention to your body and let your personal experiences guide you. Celery provides fiber, nutrients, and satisfaction, but avoid going overboard.


Research indicates that consuming a few low-calorie celery stalks during intermittent fasting is unlikely to halt fat burning or ketosis for most people. Celery provides hydration and nutrients with very minimal carbs and calories. But it may stimulate digestion a bit, so pay attention to your hunger cues. If you want to be completely conservative, avoid all foods when fasting. But moderate celery with water can aid fasting for many people.

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