Eating normal amounts of sugar doesn’t make your blood pressure go up, raise uric acid (which can cause gout), or cause fat to build up in your liver — unlike what some people claim.
Scientific Claim
Fructose-containing sugars, when consumed at levels typical of the average American diet, do not significantly raise blood pressure, uric acid, or liver fat compared to other carbohydrates.
Original Statement
“Angelopoulos TJ, Lowndes J, Sinnett S, Rippe JM . Fructose containing sugars do not raise blood pressure or uric acid at normal levels of human consumption. J Clin Hypertens 2014; 17: 87–94. ... Bravo S, Lowndes J, Sinnett S, Yu Z, Rippe J . Consumption of sucrose and high-fructose corn syrup does not increase liver fat or ectopic fat deposition in muscles. Appl Physiol Nutr Metab 2013; 38: 681–688.”
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design supports claim
Appropriate Language Strength
definitive
Can make definitive causal claims
Assessment Explanation
The cited studies are RCTs with direct measurements of biomarkers. The claim reflects the findings of those studies accurately, and the verb 'do not raise' is appropriate for RCT evidence.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.
Systematic Review & Meta-AnalysisLevel 1aIn EvidenceWhether fructose-containing sugars at normal intake levels causally affect blood pressure, uric acid, and liver fat compared to isocaloric controls.
Whether fructose-containing sugars at normal intake levels causally affect blood pressure, uric acid, and liver fat compared to isocaloric controls.
What This Would Prove
Whether fructose-containing sugars at normal intake levels causally affect blood pressure, uric acid, and liver fat compared to isocaloric controls.
Ideal Study Design
A meta-analysis of 15+ RCTs (n≥500 total) comparing 10–20% energy from sucrose or HFCS vs. starch, measuring fasting uric acid, 24-hour ambulatory blood pressure, and liver fat via MRI or MRS, with duration ≥8 weeks.
Limitation: Heterogeneity in measurement methods and populations may obscure small effects.
Randomized Controlled TrialLevel 1bIn EvidenceCausal effect of normal sugar intake on liver fat accumulation.
Causal effect of normal sugar intake on liver fat accumulation.
What This Would Prove
Causal effect of normal sugar intake on liver fat accumulation.
Ideal Study Design
A 12-week double-blind RCT of 100 overweight adults randomized to 15% of calories from HFCS or maltodextrin, with liver fat quantified by proton magnetic resonance spectroscopy (¹H-MRS) as primary endpoint.
Limitation: Short duration may miss long-term fat accumulation.
Prospective Cohort StudyLevel 2bIn EvidenceLong-term association between added sugar intake and incident hypertension or gout.
Long-term association between added sugar intake and incident hypertension or gout.
What This Would Prove
Long-term association between added sugar intake and incident hypertension or gout.
Ideal Study Design
A 15-year prospective cohort of 10,000 adults with repeated dietary assessments and annual measurements of serum uric acid and blood pressure, analyzing incidence of hypertension and gout by quintile of added sugar intake.
Limitation: Cannot prove causation due to confounding.
Evidence from Studies
Supporting (1)
Added sugars and risk factors for obesity, diabetes and heart disease
This study looked at how much sugar people normally eat and found that it doesn’t cause more harm than other carbs like bread or rice—so sugar isn’t uniquely bad for your blood pressure, liver, or uric acid when eaten in normal amounts.