Benefits of the Paleo Diet for Gut Health and More

If you’ve been dealing with bloating, fatigue, joint pain, or a health issue that never quite resolves, you’ve probably already tried cutting something out of your diet. The paleo diet is one of the most researched versions of that experiment, and it’s worth understanding what it can actually do for you before you try it again (or for the first time).

In the clinic, I’ve worked with hundreds of clients who came to paleo looking for relief from a stubborn symptom and stayed because it changed how they felt day to day. The benefits of the paleo diet that show up most often in research and in my own clinical experience center on inflammation, blood sugar, and, above all, gut health. That last one matters more than most articles on this topic let on, because a lot of the other benefits people notice, like more energy or clearer skin, tend to follow once digestion improves.

This article walks through what the paleo diet actually is, the research-backed benefits of the paleo diet you can expect, who it tends to help most, where it falls short, and how to get the good parts without the common downsides.

What Is the Paleo Diet?

The paleo diet is built around foods that resemble what humans ate before modern agriculture: meat, fish, eggs, vegetables, fruit, nuts, and seeds. It excludes grains, legumes, dairy, refined sugar, and most processed (especially ultra-processed) foods 1.

The idea is straightforward. Our genes haven’t changed much in the last 10,000 years, but our food supply has changed dramatically. Proponents argue that some of today’s most common health complaints, especially chronic inflammation and blood sugar problems, are partly a mismatch between our biology and a modern, highly processed diet 1.

It’s worth knowing there isn’t one single, official version of paleo. Research on hunter-gatherer populations shows their diets varied enormously by region and climate, from mostly meat-based in some groups to largely plant-based in others 2. That variability is actually useful context; it means “paleo” is more of a template than a rulebook, and it’s one reason we encourage clients to individualize it rather than follow a rigid list.

Foods to Eat and Foods to Limit on Paleo

Want this list somewhere you can actually reference while you shop or cook? Our free Paleo Diet Guide breaks down exactly what to eat and what to skip, so you’re not trying to remember it from a blog post while standing in the grocery aisle.

The Top Benefits of the Paleo Diet

The benefits of the paleo diet that show up most consistently across studies fall into a few categories: less inflammation, better blood sugar control, and improvements in weight and heart disease risk factors. Here’s what the research actually shows for each.

Lower Markers of Inflammation

Chronic, low-grade inflammation is involved in a surprising number of conditions, from autoimmune joint disease 3 to heart disease 4. 

A cross-sectional study of over 600 adults found that people whose diets most closely matched a paleo pattern had significantly lower levels of two inflammation markers, hs-CRP and F2-isoprostane, compared to those eating a more standard Western diet 5. This was not a controlled trial, so it only shows association, but it aligns with what a whole-food, lower-processed-food diet would be expected to do.

Better Blood Sugar and Metabolic Health

This is one of the better-studied areas of paleo research. In a small crossover trial, a paleo diet improved blood sugar control and several cardiovascular risk markers more than a standard diabetes diet did over the same period, in people with type 2 diabetes 6. A separate study found similar metabolic improvements when people with type 2 diabetes switched to a hunter-gatherer style diet 7.

A systematic review and meta-analysis of several randomized trials found paleo led to greater short-term improvements across all five components of metabolic syndrome (waist circumference, blood pressure, triglycerides, glucose, and HDL cholesterol) compared to standard guideline-based diets 8. Two of those five improvements, HDL and fasting blood sugar, didn’t reach statistical significance 8.

In plain terms, paleo tends to improve many metabolic markers, but not always every one, and the trials were small.

Support for Heart Health Risk Factors

Chronic inflammation is a known contributor to atherosclerosis, the plaque buildup that drives most heart disease 4. Paleo’s emphasis on vegetables, fruit, and healthy fats, combined with its exclusion of refined sugar and ultra-processed food, plausibly supports several heart disease risk factors at once. 

One clinical review specifically highlighted paleo’s naturally high potassium content as a plus for blood pressure 9. It is important to note that the same review emphasized that people with kidney disease or those on certain blood pressure medications should get individualized guidance before eating a very high-potassium diet 9.

Weight and Waist Circumference Improvements

A 2019 systematic review and meta-analysis pooling 11 randomized trials found that people following a paleo diet lost an average of about 3.5 kilograms (roughly 7.7 pounds) more than people on standard guideline-based diets 10. That same analysis found significant reductions in waist circumference as well 10.

A two-year randomized trial in postmenopausal women with obesity found paleo produced greater initial weight loss than a standard low-fat diet 11. The gap between the two groups narrowed over time as adherence to any strict diet naturally declines 11.

Paleo can work well for weight, but sustainability matters as much as the diet itself.

The Paleo Diet and Gut Health

Of everything paleo can do, the gut health benefits are the ones I’d point to first, and the ones I think get the least attention in most articles on this topic.

How Removing Grains, Legumes, and Processed Food Affects Digestion

A diet built around whole foods and less processed carbohydrates and highly processed oils naturally shifts the environment your gut bacteria live in.

• Diet is one of the biggest drivers of intestinal inflammation, and a more anti-inflammatory eating pattern is one practical way to influence it 12 13.
• A small case series of people with inflammatory bowel disease on an anti-inflammatory, largely paleo-style diet reported symptom improvement 14.
• That was a preliminary study without a control group, so it’s a starting point for the idea rather than proof on its own 14.

For clients dealing with bloating, irregular bowel movements, or a general sense that their gut isn’t working right, diet is the place to start. Removing common irritants, like ultra-processed foods and excess sugar, is often the most impactful step to take before we ever get to supplements.

The Gut-Brain Connection

Gut health and mood are more connected than most people realize. A systematic review found that interventions aimed at improving the gut microbiome, including dietary changes, were associated with reductions in anxiety symptoms 15.

This is one reason clients often tell me their thinking feels clearer and their mood feels steadier a few weeks into eating this way, even before any labs change.

When Paleo Alone Isn’t Enough

Here’s something I want to be upfront about:

• Paleo helps a lot of people, but it isn’t a universal fix for gut symptoms, especially in anyone with irritable bowel syndrome (IBS), small intestinal bacterial overgrowth (SIBO), or a sensitive gut.
• Some paleo-friendly foods, like garlic, onions, apples, and certain nuts, are actually high in FODMAPs, which are fermentable carbohydrates that can trigger bloating and gas in a reactive gut 16.

If you’ve been strict about paleo for a month and you’re still dealing with bloating or irregular digestion, the diet probably isn’t the problem. It’s more likely that specific paleo-approved foods are still triggering your gut, and layering in a low-FODMAP diet on top of your paleo foundation is usually the next right step.

Benefits of the Paleo Diet for Specific Health Conditions

The benefits of the paleo diet aren’t limited to general markers like inflammation and weight. For a few chronic conditions in particular, both the research and our clinical experience get a lot more specific.

Irritable bowel syndrome (IBS) and functional gut symptoms. Removing common trigger foods and highly processed carbohydrates often reduces bloating, gas, and irregular bowel movements on its own. When it doesn’t fully resolve symptoms, combining paleo with a low-FODMAP approach is a good option, since low FODMAP is well-supported in the research for improving IBS symptoms 17 18.

Autoimmune and inflammatory joint conditions. Conditions like rheumatoid arthritis and psoriatic arthritis share inflammation as a common thread 3. While there’s less direct paleo-specific research on autoimmune joint disease than we’d like, the diet’s anti-inflammatory profile and its overlap with gut-health-focused eating patterns make it a reasonable, low-risk starting point, ideally alongside your rheumatologist’s or practitioner’s guidance rather than in place of it. 

For clients whose autoimmune symptoms don’t fully settle on standard paleo, the next step up is typically the autoimmune protocol (AIP), an elimination diet that temporarily removes additional common triggers like eggs, nuts, seeds, and nightshade vegetables. It’s more restrictive, so we don’t recommend starting there, but it’s a reasonable second-line option for people who need a more targeted elimination approach.

Type 2 diabetes and prediabetes. This is one of the strongest evidence bases for paleo. Two randomized trials in people with type 2 diabetes have found improvements in blood sugar control, insulin sensitivity, and cardiovascular risk factors on a paleo diet compared to standard diabetes diets 6 7. If you’re prediabetic or managing type 2 diabetes, this is an area where the research genuinely supports giving paleo a trial, in coordination with whoever manages your blood sugar medications.

Whatever brought you here, the same principle applies: start with the diet itself, pay attention to how your body responds, and add a more targeted approach only if you need it.

The Downsides and Limitations of the Paleo Diet

Being evidence-based means looking honestly at the downsides too, not just the wins.

On the calcium question specifically: Research on calcium absorption suggests the calcium in kale is actually absorbed at least as efficiently as the calcium in milk. Leafy greens are a legitimate way to help close that gap, even though you’d need larger servings to match dairy’s total calcium content 21.

A few additional caveats worth knowing:

• It’s restrictive by design. Cutting out entire food groups is hard to sustain indefinitely, and strict adherence tends to decline over time in most long-term studies 11. At least one clinical review has specifically cautioned against overstating paleo’s benefits, given how limited and mixed the current evidence base still is 22.
• Long-term gut microbiome data is mixed. A cross-sectional study of long-term strict paleo followers found lower intake of resistant starch and higher levels of TMAO, a gut-derived compound associated with cardiovascular disease, compared to people eating a more standard diet with whole grains 19.
• There’s no single official version. Because “paleo” isn’t standardized, study results vary depending on how strict participants were, which affects how much you should expect any one study to predict your own results 2.

How to Get the Benefits of the Paleo Diet Without the Downsides

In the clinic, I don’t ask clients to overhaul everything at once. A layered, stepwise approach almost always works better than an all-or-nothing overhaul, and I’d apply the same principle here.

Bring in a practitioner for anything complex. If you have an autoimmune condition, are on medication for blood pressure or diabetes, or have tried multiple diets without lasting success, working with a practitioner helps you individualize the plan instead of guessing.

Start with a template. Build meals around protein, vegetables, and healthy fats first, then fill in the rest. Aim for consistency, not perfection.

Protect your fiber intake. Load up on a wide variety of vegetables and some fruit to offset the fiber and resistant starch you’d normally get from grains and legumes.

Use the 85/15 approach for sustainability. Eating paleo-compliant foods around 85% of the time, with flexibility the other 15%, is far easier to sustain long term than a strict, all-or-nothing approach, and sustainability is what actually determines your results.

Watch your gut’s response, not just the scale. If bloating, gas, or irregular bowel movements haven’t improved within 4 to 6 weeks, that’s your signal to investigate further rather than push harder on the same plan.

Layer in gut-specific support if needed. For clients whose symptoms persist, I typically recommend starting with a low-FODMAP diet layered on top of their paleo foundation, and in some cases a triple therapy probiotic protocol to help rebalance the gut microbiome. A well-formulated Triple Therapy Probiotic can be a reasonable next step here, alongside diet, not instead of it. For autoimmune symptoms that don’t respond to standard paleo, the autoimmune protocol (AIP) is the more targeted next step, since it may help some people identify foods that worsen their symptoms.

Consider a short reset for stubborn cases. For clients with more entrenched gut issues who haven’t responded to diet changes alone, a brief course of Elemental Heal, a hypoallergenic meal-replacement formula, can give the gut a break and support healing before reintroducing a fuller paleo template.

Get a baseline read on where you’re starting. If you’re not sure whether your gut is part of the picture, our gut health quiz is a quick way to get oriented before you dive in.

Bottom Line on the Benefits of Paleo Diet

The benefits of the paleo diet are reasonably supported by research, particularly for inflammation, blood sugar, weight, and gut health. You don’t need to memorize food lists or second-guess every meal to get started. Our free Paleo Diet Guide lays out exactly what to eat and what to skip, so you can start eating this way today, without the guesswork. It’s not a magic fix, and it comes with notable trade-offs if you approach it too rigidly or ignore fiber and micronutrient needs. But used as a flexible template, with gut health as your starting point rather than an afterthought, it’s one of the more evidence-based ways to start feeling better.

If you’ve tried paleo before and didn’t get the results you expected, that doesn’t mean it failed. It often means your gut needs more targeted support first. In my book, Healthy Gut, Healthy You, diet and probiotics are the first two steps in my Great-in-8 plan for exactly this reason: get the foundation right before adding anything else. If you want individualized guidance, our virtual clinic team is here to help you figure out what your gut actually needs.

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