Oat beta-glucan and cholesterol across 28 trials in people
What it found
Eating at least 3 g of oat beta-glucan a day lowered LDL and total cholesterol slightly in people.
It did not change HDL cholesterol or triglycerides.
What they found
Studies in people
LDL and total cholesterol
Eating at least 3 g of oat beta-glucan daily lowered LDL cholesterol by 0.25 mmol/L and total cholesterol by 0.30 mmol/L compared with the control diet. The amount taken each day ranged from 3.0 to 12.4 g, but higher amounts did not lower cholesterol further.
HDL cholesterol and triglycerides
Oat beta-glucan made no significant difference to HDL cholesterol or triglyceride levels compared with the control diet.
Effect in people with diabetes
People with type 2 diabetes saw a larger drop in both LDL and total cholesterol than people without diabetes. However, this finding came from only a few studies.
Starting cholesterol matters
The drop in LDL cholesterol was larger in people whose starting LDL cholesterol was already high.
Other findings
How oat fiber is processed
The size of the oat beta-glucan molecules can shrink during food production, especially when making bread. Smaller molecules may be less effective at lowering cholesterol.
What the authors conclude
- They conclude there is strong evidence that eating at least 3 g of oat beta-glucan daily lowers LDL and total cholesterol in adults, including those with type 2 diabetes.
- They suggest future research should test whether taking more than 3 g gives extra benefit and whether the effect lasts beyond three months.
- They advise that future studies should measure the physical properties of the oat fiber in foods to make sure it works as intended.
How it was done
Food standards agencies around the world have accepted claims that soluble fiber from oats lowers cholesterol when eaten at 3 g or more per day. The authors wanted to update earlier summaries because many new trials had been published since 2005.
They combined results from 28 randomized controlled trials involving adults who were healthy, had high cholesterol, or had type 2 diabetes. People ate at least 3 g of oat beta-glucan daily for 2 to 12 weeks, compared with a control food low in soluble fiber.
What it can’t tell you
- None of the included trials lasted longer than 12 weeks, so these results cannot show what happens over many months or years.
- Because the analysis combines many different trials, it cannot prove that oat beta-glucan alone caused the cholesterol changes in every case.
- The stronger effect seen in people with diabetes came from very few studies, so scientists do not yet know if that holds true more broadly.
Who paid
- Authors work at
- Lancaster University, United Kingdom (AW); University of Wollongong, Australia (EJB); University of Toronto, Canada (TMSW)
The paper
- Title
- Cholesterol-lowering effects of oat β-glucan: a meta-analysis of randomized controlled trials
- Type
- Meta-analysis
- Evidence
- Studies in people
- Summarised from
- Full text
- Cite
- Whitehead A, Beck EJ, Tosh S, Wolever TM (2014). Cholesterol-lowering effects of oat β-glucan: a meta-analysis of randomized controlled trials. The American journal of clinical nutrition. doi:10.3945/ajcn.114.086108Free full textPubMed 25411276DOI
Summary written 30 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error