Apple cider vinegar has gained significant popularity in the wellness community over the past few years.  From celebrity endorsements to viral social media trends, many people are turning to apple cider vinegar in hopes of improving digestion, boosting energy, or even supporting weight management.

But how much of this hype is backed by evidence, and is there really a “best time” to drink apple cider vinegar?  In this post, we’ll explore the science behind apple cider vinegar, discuss the potential benefits and risks, and answer some common questions.  Remember, everyone’s body and health goals are unique — if you’d like personalized guidance, consider booking an appointment with one of our Functional Dietitian Practitioners today!

What Is in Apple Cider Vinegar (ACV)?

ACV is made through a two-step fermentation process.  First, yeast converts the natural sugars in crushed apples into alcohol¹.  Then, specific bacteria — typically Acetobacter species — convert that alcohol into acetic acid, creating a liquid that is about 4-6% acetic acid¹.  This natural fermentation is essentially a controlled spoilage process that yields the tangy, sour vinegar we know​. 

That acetic acid is the star of the show and is largely responsible for ACV’s potential health benefits.  Research shows that acetic acid may help with post-meal blood sugar control by slowing down digestion, delaying gastric emptying, and improving glucose uptake into cells².  It may also help increase satiety and support modest improvements in metabolic health³.

Nutritionally, ACV is very low in calories, with negligible amounts of vitamins and minerals.  It contains trace levels of potassium and some polyphenol antioxidants, but not enough to be considered a meaningful source of nutrients⁴.

How To Consume Apple Cider Vinegar 

There are a few different ways to incorporate ACV into your routine:

• Diluted in Water: The most common method is mixing 1-2 tablespoons with a full glass (8 oz) of water.  This helps reduce the risk of throat irritation and tooth enamel erosion.

• In Cooking: ACV can be added to salad dressings, marinades, or sauces.  

• Straight Shots: NOT recommended.  Undiluted ACV is highly acidic and can harm your teeth and esophagus over time!

Pro Tip: Use a straw to minimize contact with your teeth and rinse your mouth afterward

What Are the Risks of Drinking Apple Cider Vinegar?

While ACV is generally safe for most people when used in moderation, there are a few precautions to keep in mind:

• Tooth Enamel Erosion: The high acidity of ACV can weaken enamel over time.

• Digestive Discomfort: Some people experience upset stomach, nausea, or acid reflux, especially if taken on an empty stomach.

• Medication Interactions: ACV may interact with diuretics, insulin, or other diabetes medications.  Always check with your healthcare provider before adding it to your routine.

Benefits Of Drinking Apple Cider Vinegar 

One of the most studied benefits of ACV is its role in supporting blood sugar control.  Research shows that when consumed before or with a high-carbohydrate meal, acetic acid can help reduce post-meal blood glucose spikes by slowing digestion and improving insulin sensitivity².  

ACV is also widely used for digestive support.  Though evidence is mostly anecdotal, some people find that it helps reduce bloating and promotes regularity.  The acidity may help with low stomach acid, and unfiltered versions may offer minor probiotic benefits.

Best Time of Day to Drink Apple Cider Vinegar

Many people choose to drink ACV in the morning, believing it “kickstarts” digestion or metabolism.  While this routine works well for some, research does not indicate that there is a “best” time of day to consume ACV.  The most important factor is consistency and tolerance.  If morning works for your schedule and digestive comfort, go for it!

Is Timing Just a Myth?

Current research does not support the idea that ACV is more effective at a particular time of day.  Its blood sugar-regulating effects are most pronounced when consumed before or with a carbohydrate-rich meal.  So rather than focusing on the time of day, focus on pairing it with meals where you want to blunt a blood sugar spike.

Final Thoughts

Apple cider vinegar isn’t a cure-all, but it can be a helpful tool — especially for supporting healthy blood sugar, digestion, and appetite regulation.  Just remember to dilute it, avoid overuse, and don’t rely on it as your primary source of nutrition.  

For personalized advice on how ACV (or any supplement) fits into your health plan, book a session with one of our Registered Dietitians — we’re here to help.

FAQs:

Q: Can apple cider vinegar replace a meal?

         A: No! Apple cider vinegar contains very few calories and virtually no protein, fat, or essential nutrients.  It should never be used as a meal replacement — your body needs a balanced intake of macronutrients and vitamins to function properly.

Q: Is apple cider vinegar safe for everyone?

         A: While generally safe in small amounts, apple cider vinegar isn’t for everyone.  It can irritate the digestive tract, damage tooth enamel, or interfere with certain medications, particularly for those with diabetes or low potassium levels.  Always check with your healthcare provider before adding it to your routine.

Q: How much apple cider vinegar should I drink each morning?

         A: Most people do well with 1-2 tablespoons diluted in a large glass of water.  It’s best to start with a smaller amount to see how your body reacts, and always avoid drinking it straight to protect your teeth and stomach lining.

References

1. McDonald, E. (2018, August 23). Debunking the health benefits of Apple Cider Vinegar. UChicago Medicine. https://www.uchicagomedicine.org/forefront/health-and-wellness-articles/debunking-the-health-benefits-of-apple-cider-vinegar
2. Santos, H. O., de Moraes, W. M. A. M., da Silva, G. A. R., Prestes, J., & Schoenfeld, B. J. (2019). Vinegar (acetic acid) intake on glucose metabolism: A narrative review. Clinical nutrition ESPEN, 32, 1–7. https://doi.org/10.1016/j.clnesp.2019.05.008
3. Hlebowicz, J., Darwiche, G., Björgell, O. et al. Effect of apple cider vinegar on delayed gastric emptying in patients with type 1 diabetes mellitus: a pilot study. BMC Gastroenterol 7, 46 (2007). https://doi.org/10.1186/1471-230X-7-46
4. Budak, N. H., Aykin, E., Seydim, A. C., Greene, A. K., & Guzel-Seydim, Z. B. (2014). Functional properties of vinegar. Journal of food science, 79(5), R757–R764. https://doi.org/10.1111/1750-3841.12434