Good digestion isn't about one miracle habit — it's a handful of ordinary ones, most of which you're probably already underdoing. Here's what the research actually supports, including a correction on one popular "digestive enzyme" claim that isn't quite accurate.

Written by Vita Globe Editorial Team | Reviewed against peer-reviewed research and NIH guidance

Hydration: Why Water Matters More Than You Think

Water isn't just a nice-to-have for digestion — it's what allows fiber to actually do its job. NIH's National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) recommends drinking water and other fluids specifically "to help the fiber work better," as part of preventing and relieving constipation^[2]. Without enough fluid, a high-fiber diet can actually make constipation worse rather than better, since fiber absorbs water to form soft, easy-to-pass stool.

Exact fluid needs vary by person, activity level, and climate, so NIDDK recommends checking with a healthcare provider for your specific target rather than a single blanket number. A practical starting point: if your urine is consistently pale yellow and you're not frequently thirsty, you're likely in a reasonable range.

Fiber: The Nutrient Almost Everyone Is Short On

Fiber is arguably the single most under-consumed nutrient relevant to digestion. The Dietary Guidelines for Americans recommend 22-34g of fiber per day depending on age and sex^[1], but most Americans get only around 16g — less than half the target for many people. Fiber supports regularity by adding bulk and softness to stool, and also feeds the beneficial bacteria that make up your gut microbiome.

Good sources include whole grains, legumes, fruits, vegetables, and nuts^[2]. If you're well below the target, add fiber gradually rather than all at once — a sudden jump can cause gas and bloating — and increase fluid intake alongside it, for the reason above.

Chewing: Digestion Starts Before You Swallow

It's easy to think of digestion as something that happens in your stomach, but NIH's NIDDK is direct about where it actually begins: "the digestive process starts in your mouth when you chew"^[3]. Your salivary glands produce saliva that both moistens food for easier swallowing and contains an enzyme that begins breaking down starches before food ever reaches your stomach.

Chewing thoroughly also mechanically breaks food into smaller pieces, giving digestive enzymes further down the tract more surface area to work with. Eating quickly and swallowing large, poorly chewed pieces shifts more of that workload onto your stomach and intestines, which is a reasonable, low-effort thing to fix regardless of what else you change.

Probiotics: Not All Strains Are Equal

Probiotics are one of the more evidence-backed digestive supplements, but with an important caveat: NIH's fact sheet is explicit that "because the effects of probiotics can be specific to certain probiotic strains, recommendations for their use...need to be strain-specific"^[4]. In other words, "probiotics" isn't one thing — a strain that helps with one issue may do nothing for another.

The clearest evidence is for antibiotic-associated diarrhea, where specific strains (like Lactobacillus rhamnosus GG and Saccharomyces boulardii) reduced risk by roughly 51% in adults when started within a couple days of the first antibiotic dose^[4]. For general gut balance and IBS-type symptoms, multiple strains have shown modest benefits, with multi-strain products sometimes outperforming single strains — which is why Vita Globe's Super Probiotic Gummies use a multi-strain formula rather than a single organism.

Where Apple Cider Vinegar Actually Fits

Apple cider vinegar is popular for digestion, but it's worth being precise about what it is and isn't. It is not a source of digestive enzymes in any meaningful sense — that's a common misconception. Unpasteurized, unfiltered ACV (the kind "with the mother") does contain some protein and bacteria from fermentation, but reviewers of the evidence are candid that "there isn't any robust research showing that apple cider vinegar" reliably relieves bloating or otherwise improves digestion^[5].

That doesn't mean it's harmful for most people in normal amounts — it's generally considered low-risk, aside from tooth enamel erosion and potential stomach irritation if taken undiluted or in excess. Some people include Vita Globe's Sugar Free Apple Cider Vinegar Gummies as part of their routine simply because they prefer gummies to the taste of liquid vinegar, not because of a proven enzyme effect. If digestive support is the specific goal, fiber, hydration, and strain-specific probiotics have considerably more evidence behind them.

The honest summary

• Fiber and water are the two habits worth prioritizing first — most people are well under the 22-34g/day fiber target, and fluid is what makes fiber actually work^[1][2].
• Probiotics can genuinely help, but the strain matters — a random probiotic isn't interchangeable with one studied for your specific concern^[4].
• Apple cider vinegar is not a digestive enzyme source, and the evidence for its digestive benefits is thin — it's fine to enjoy, but it shouldn't be the centerpiece of a digestion plan^[5].

Frequently Asked Questions

What's the fastest way to improve digestion this week?

Start with fluid and fiber together, since NIDDK specifically frames adequate fluid as what makes fiber "work better"^[2]. Add fiber gradually — beans, oats, fruit with the skin on, vegetables — while making sure your water intake keeps pace, rather than spiking fiber alone.

Are probiotics and prebiotics the same thing?

No. Probiotics are live beneficial bacteria (found in foods like yogurt and kefir, or in supplements). Prebiotics are a type of fiber that feeds the beneficial bacteria already in your gut. They work together, which is why some people use both — a probiotic to introduce or support helpful strains, and a prebiotic fiber to help those strains thrive.

Does apple cider vinegar help with bloating?

There isn't solid research supporting that specific claim. A review from the Canadian Digestive Health Foundation found "there isn't any robust research showing that apple cider vinegar will do the trick" for bloating relief^[5]. If bloating is a recurring issue, fiber intake, eating pace, and any food intolerances are more evidence-backed places to look first.

Sources

1. U.S. Dietary Guidelines for Americans, 2020-2025. Fiber intake recommendations.
2. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), NIH. "Eating, Diet, & Nutrition for Constipation."
3. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), NIH. "Your Digestive System & How It Works."
4. National Institutes of Health, Office of Dietary Supplements. "Probiotics — Health Professional Fact Sheet."
5. Canadian Digestive Health Foundation. "Apple Cider Vinegar for Digestion. What's the Deal?"

Also available on Amazon: Apple Cider Vinegar Gummies.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for medical advice. Talk to your healthcare provider before starting any new supplement, particularly if you are pregnant, nursing, immunocompromised, taking medication, or caring for an infant.