Paleo Diet Health Benefits: What Research Shows

By Paleo Life Coach Editorial Team · Last updated October 8, 2026 · Trial results from published abstracts on PubMed

People try the paleo diet for many reasons beyond weight loss. This review looks at the health benefits most often linked to paleo and what the research actually says about each one.

Bottom line: In small trials lasting 6 months or less, paleo diets improved waist size, triglycerides, blood pressure and some blood sugar measures more than guideline-based diets. Claims about digestion, skin, immunity and mood rest mostly on personal reports, not paleo trials, and in the one 2-year trial the extra fat loss faded.

Consider this general nutrition reading, not a replacement for advice from your doctor or a registered dietitian.

What to remember

A 2015 meta-analysis of 4 trials linked paleo to short-term improvements in metabolic syndrome markers such as waist size and triglycerides.
Inflammation results are mixed: a 2-week trial found no change in inflammation markers.
One 12-week study of 43 young men linked a lower-glycemic diet (not paleo specifically) with less acne.
Diet and depression is an active research area, but no solid trial has tested a paleo diet for depression.
Most trials ran from 2 weeks to 6 months; in the one 2-year trial, paleo’s extra fat loss at 6 months was no longer significant at 24 months.

Paleo Trial Results at a Glance

These are the studies most often cited for paleo health benefits, with the numbers from their published abstracts.

What published paleo trials measured
Study	Who and how long	Main result (paleo vs comparison)
Manheimer et al., 2015 (meta-analysis)	4 randomized trials, 159 people with metabolic syndrome features, up to 6 months	Waist 2.38 cm smaller, triglycerides 0.40 mmol/L (about 35 mg/dL) lower, systolic blood pressure 3.64 mm Hg lower; evidence rated moderate
Lindeberg et al., 2007	29 people with heart disease plus glucose intolerance or type 2 diabetes, 12 weeks, vs Mediterranean-like diet	Glucose curve fell 26% vs 7%
Boers et al., 2014	32 adults with metabolic syndrome, 2 weeks, vs Dutch guideline diet	Lower blood pressure and total cholesterol; no change in inflammation or gut permeability markers
Mellberg et al., 2014	70 postmenopausal women with obesity, 2 years, vs Nordic Nutrition Recommendations diet	More fat loss at 6 months (6.5 vs 2.6 kg), not significant at 24 months; triglycerides fell more at both points

For the cholesterol and diabetes trials in more detail, see our paleo diet cholesterol guide and paleo diet for type 2 diabetes.

Metabolic Health Improvements

Several small trials found paleo diets improved blood sugar measures and metabolic syndrome markers more than guideline-based diets over weeks to months. People on paleo in these trials often ate less and lost more weight, which explains part of the effect.

Cardiovascular Benefits

Small, short-term studies have found better cholesterol, lower blood pressure and improved heart health markers on paleo.

Anti-Inflammatory Effects

Paleo is often described as anti-inflammatory, but the trial evidence is thin. In the 2-week Boers trial, blood pressure and cholesterol improved, yet inflammation markers did not change.

📊 Research Note:

Most paleo studies were short, lasting 6 months or less with small groups, so long-term effects are less clear.

The evidence so far comes mostly from small, short-term studies, so paleo’s health benefits look promising but are not yet firmly established over the long term.

Improvements in Digestive Health

Some people on the paleo diet report less bloating or fewer irritable bowel syndrome (IBS) symptoms, but paleo has not been well tested for digestive conditions. Keep in mind that paleo removes whole grains and legumes, which are major fiber sources, so eat plenty of vegetables, fruit, nuts and seeds to keep fiber up.

Enhanced Cognitive Function

Some people report clearer thinking on paleo, but there is little direct research on paleo and brain health. Cutting heavily processed foods and eating more fish, nuts and vegetables fits general healthy-eating advice, yet no study shows paleo lowers the risk of Alzheimer’s.

Better Skin Health

Some people on the paleo diet report clearer skin. The closest research looks at refined carbohydrates rather than paleo itself.

Paleo and Skin Health

Research on diet and acne mostly looks at refined carbohydrates. One 12-week study of 43 young men found that a lower-glycemic diet reduced acne (Smith et al., 2007). That diet was not paleo, but paleo also cuts out most refined carbs, so it may help some people. Paleo itself has not been well tested for acne.

Increased Energy Levels

Some people report more steady energy on the paleo diet, often after cutting sugary snacks and refined carbohydrates. No trial has measured energy as a main outcome, so treat this as a personal report rather than a proven effect.

Improved Sleep Quality

Some people say they sleep better on paleo, but no trial has tested paleo for sleep. Strict paleo excludes coffee, but many modern versions allow it, so if sleep is your goal, keep caffeine to the morning.

Immune health

There is no good evidence yet that a paleo diet boosts the immune system. What it can do is replace many processed foods with vegetables, fruit and protein, which supports overall health.

Reduction in Allergies

Paleo removes wheat, milk, soy and peanuts, four of the nine major food allergens the FDA lists, which only helps if you react to one of them. It keeps eggs, fish, shellfish and tree nuts, which are also on the FDA list (FDA: food allergies). If you suspect a food allergy, get tested rather than relying on an elimination diet.

Mental Health

Paleo and Mental Health

Research on diet and depression is growing, but no solid clinical trial has tested a paleo diet for major depressive disorder. If you live with depression, treat diet changes as a support to care from your doctor, not a replacement.

What the evidence adds up to

The best-supported benefits are short-term improvements in waist size, triglycerides, blood pressure and some blood sugar measures in small trials of up to 6 months. Claims about immunity, digestion, skin, energy and mood rest mostly on personal reports. As always, listen to your body and work with a healthcare provider to decide if the paleo diet is right for you.

Frequently Asked Questions

How long does it take to see health benefits on the paleo diet?

Most paleo trials lasted 2 weeks to 6 months and measured markers like blood sugar, cholesterol and blood pressure. In the one 2-year trial, extra fat loss seen at 6 months was no longer significant at 24 months.

Can the paleo diet help with acne?

One 12-week study of 43 young men found that a lower-glycemic diet (not paleo specifically) reduced acne. Paleo also cuts most refined carbohydrates, so it may help some people, but paleo itself has not been well tested for acne.

Does the paleo diet reduce inflammation?

The evidence is mixed. Paleo cuts many processed foods, but in a 2-week controlled trial inflammation markers did not change even though blood pressure and cholesterol improved. There are no long-term paleo trials on inflammation.

Is the paleo diet good for mental health?

Does the paleo diet improve digestive health?

Some people report less bloating or fewer IBS symptoms on paleo, but it has not been well tested for digestive conditions. Because paleo removes whole grains and legumes, eat plenty of vegetables, fruit, nuts and seeds to keep fiber up.

Research cited in this guide

We checked this guide against the nutrition and health sources below. They are worth reading for the underlying detail.