Pecan nut effects on cholesterol, blood sugar and weight in adults
What it found
In 10 trials in people, eating pecans lowered total cholesterol, LDL cholesterol and triglycerides.
It made little difference to blood sugar, body weight or blood pressure.
What they found
Studies in people
Cholesterol and triglycerides
Eating pecans lowered total cholesterol by about 8.49 mg/dL and LDL cholesterol by about 7.42 mg/dL across 7 studies. Triglycerides fell by about 14.06 mg/dL, mostly in trials lasting longer than 4 weeks.
Good cholesterol unchanged
HDL cholesterol did not change in a meaningful way across 7 studies. This held true no matter how much pecan people ate or for how long.
Blood sugar and insulin
Fasting blood sugar, insulin levels and insulin resistance scores were about the same whether people ate pecans or not. These measures came from 3 or 4 studies each.
Body weight and waistline
Body weight, BMI and waist size showed no real differences between pecan eaters and control groups. Each measure was checked in 3 or 4 studies.
Blood pressure
Systolic and diastolic blood pressure did not differ between groups across 4 studies. The results varied widely from trial to trial, so scientists do not yet know if pecans affect blood pressure.
What the authors conclude
- They say pecans improve cholesterol and triglyceride levels but do not clearly change blood sugar, body weight or blood pressure.
- They suggest pecans can be part of a diet aimed at supporting heart health.
- They call for larger, longer trials in people who already have higher risks for heart disease or diabetes.
How it was done
Pecans contain fats, fiber and plant compounds that might help heart health. But past trials gave mixed results, so the authors wanted to combine them into one clear picture.
They combined 10 randomized trials involving adults aged about 37 to over 62 years. People ate between 30 g/day and 68 g/day of pecans for 4 to 12 weeks. They compared those groups with people who followed diets without pecans.
What it can’t tell you
- These trials lasted only 4 to 12 weeks, so they cannot show what happens when people eat pecans for years.
- Most participants were generally healthy or had only mild risk factors, so the results may not apply to people with serious conditions like type 2 diabetes.
- Because these are short trials measuring blood markers, they cannot show whether eating pecans prevents heart attacks or strokes.
Who paid
- Conflicts
- Declarations. Ethics approval and consent to participate: No applicable. Consent for publication: No applicable. Competing interests: The authors declare no competing interests.
- Authors work at
- Fuwai Yunnan Cardiovascular Hospital, China; Tehran University of Medical Sciences, Iran
The paper
- Title
- The effect of pecan consumption on cardiometabolic risk factors: a systematic review and meta-analysis of randomized controlled trials
- Type
- ReviewThe authors read earlier studies and describe what they found. It isn’t a new study.
- Evidence
- Studies in people
- Summarised from
- Full text
- Cite
- Zhang Z, Sohouli MH (2026). The effect of pecan consumption on cardiometabolic risk factors: a systematic review and meta-analysis of randomized controlled trials. Diabetology & metabolic syndrome. doi:10.1186/s13098-026-02212-1Free full textPubMed 42298717DOI
Summary written 30 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error