Onion dip: a salty, fatty spread with a little onion in it

The strongest onion evidence on this page comes from capsules and extracts. A meta-analysis of 14 randomized trials found that onion supplements improved LDL cholesterol, total cholesterol and systolic blood pressure in adults, and the abstract gives no sizes for those changes. Nobody has tested onion dip itself. What we can measure is what is in the tub. Regular onion dip in US survey data carries 563 mg of sodium and 346 calories per 3.5 oz (100 g), with 35.8 g of fat, 8.7 g of it saturated. A 70 g individual container works out to about 394 mg of sodium, 242 calories and 25 g of fat, figures recalculated from 100 g for one averaged recipe, and commercial brands differ. A single tablespoon of 15 g is closer to 84 mg of sodium. The light and yogurt based versions barely move the salt, at 481 and 507 mg per 3.5 oz (100 g).

Every statement here is tied to a source. The badge says what kind of evidence stands behind it: A is a meta-analysis or systematic review, E is the position of an expert body without its own analysis. How we verify →

As people eat it, per 3.5 oz (100 g)

As eaten	kcal	Protein	Fat	Carbs	Fiber
Onion dip, light	166	2 g	12.4 g	11.9 g	0.1 g
Onion dip, regular	346	2.15 g	35.8 g	3.92 g	0.2 g
Onion dip, yogurt based	160	6.82 g	12.9 g	4.06 g	0.2 g

USDA Food and Nutrient Database for Dietary Studies (FNDDS, release 2024-10-31): onion dip as it is prepared and served, from the recipes behind the national dietary survey, rather than a single laboratory sample.

How much is actually in it

Light and yogurt based onion dips are only modestly lower in sodium than regular: 481 and 507 mg per 3.5 oz (100 g) versus 563 mg. — US survey foods, FNDDS fdc_id 2705622 (light) and 2705445 (yogurt based) vs 2705621 (regular) Evidence E source
481 mg (light), 507 mg (yogurt based), 563 mg (regular) sodium per 3.5 oz (100 g)

What a real portion looks like

Regular onion dip carries 563 mg sodium per 3.5 oz (100 g), about 84 mg in one tablespoon (15 g) and 394 mg in a 70 g individual container. — US survey food, FNDDS food code 12350220 (fdc_id 2705621) Evidence E source
563 mg/100 g; 84.5 mg per 15 g; 394 mg per 70 g
Regular onion dip provides 346 calories, 35.8 g fat and 8.7 g saturated fat per 3.5 oz (100 g), so a 70 g container gives about 242 calories and 25 g fat. — US survey food, FNDDS food code 12350220 (fdc_id 2705621) Evidence E source
346 calories, 35.77 g fat, 8.745 g saturated fat per 3.5 oz (100 g); 242 calories and 25.0 g fat per 70 g

What your body absorbs

In a crossover trial in 16 healthy adults, quercetin from onion powder reached a peak plasma level of 273 ng/mL at about 2 h, roughly four times the peak from apple peel powder. — healthy volunteers, 8 women and 8 men, single doses (n = 16) Evidence B source
Cmax 273.2 ± 93.7 ng/mL (onion powder) vs 63.8 ± 22.4 ng/mL (apple peel powder); tmax 2.0 h vs 2.9 h
In a crossover trial in 6 men, quercetin from red onion in soup was absorbed so well that about 10 mg from onion matched 166 mg from a supplement tablet. — healthy non-smoking adult men, fasting, two single meals 3 days apart (n = 6) Evidence B source
24 h urinary quercetin 1.69 ± 0.79 umol (onion, 47 mg) vs 1.17 ± 0.44 umol (tablet, 544 mg), P = 0.065

What cooking and storage change

In rats, meals with onion peel powder raised plasma quercetin more than peel extract, bulb powder, bulb extract or sauteed bulb, so processing form changes how much quercetin gets through. — Wistar rats (main comparison) plus a small human ingestion check Evidence D source
Peel powder meal gave significantly higher plasma quercetin at each time point; magnitude not in abstract

What it does to your health

A meta-analysis of 14 RCTs found onion supplementation improved LDL cholesterol, total cholesterol, HDL cholesterol and systolic blood pressure. — adults in 14 randomized trials of onion supplements (searched to October 2022) (n = 14 RCTs) Evidence A source
Significant improvements in LDL-c, TC, HDL-c, SBP, body fat percentage; weighted mean differences not given in abstract

Safety, limits and interactions

A case report describes a woman whose onion and garlic sensitivity began with nasal itching after eating red onion dip, later confirmed by a positive onion and garlic skin test. — one 32-year-old woman with migraine with aura (n = 1) Evidence D source
Positive allergy skin test to garlic and onion; aroma-triggered migraines

Who this works differently for

In a pilot comparison, an onion meal cut the peak blood glucose rise more in lactose-intolerant adults than in lactose-tolerant adults, 44.2% versus 19.3%. — adults, 12 lactose-tolerant and 12 lactose-intolerant, glucose tolerance test (n = 24) Evidence C source
Peak glucose reduction 44.2% vs 19.3% (P=0.04); iAUC reduction 54.5% vs 42.1% (P=0.42, not significant)

The bottom line

Onion does deliver quercetin, a plant pigment, and the body absorbs it. In a crossover trial in 16 healthy adults, dried onion powder raised blood quercetin to a peak of 273 ng/mL at about 2 hours, roughly four times the peak from apple peel powder. That was a single dose of powder in a small group, measured in plasma, and it was not a dip. In 6 men eating red onion in soup, urinary quercetin after about 47 mg from onion did not differ significantly from a 544 mg supplement tablet (P = 0.065). The authors worked out that about 10 mg from onion was comparable to 166 mg from the tablet. How much onion actually sits in a dip, and whether dried onion behaves like fresh, no card here tells us. One non-randomized pilot in 24 adults found an onion meal cut the peak blood glucose rise by 44.2 percent in lactose-intolerant people against 19.3 percent in lactose-tolerant people. The total glucose response did not differ significantly between the groups, so treat this as an unconfirmed lead. Who should be careful: people allergic to onion or garlic. One published case describes a woman whose sensitivity first showed as nasal itching after red onion dip, later confirmed by a positive skin test to both. That is one person, and it tells you the dip can carry the allergen and says nothing about how common it is. If you watch your salt, the portion matters more than the label: a container of dip is already a sizeable share of a day.

Related foods

Onions: the trials tested powder, extract and capsules

Sources

odip-daily-r5-03 · food composition dataset
Sodium, Na per 100 g: Onion dip, light (fdc_id 2705622) 481 mg; Onion dip, yogurt based (fdc_id 2705445) 507 mg; Onion dip, regular (fdc_id 2705621) 563 mg
USDA FoodData Central survey foods (FNDDS) 2024-10-31, fdc_id 2705622 and 2705445 · checked 2026-09-29
odip-daily-r5-01 · food composition dataset
Onion dip, regular, FNDDS code 12350220, fdc_id 2705621, per 100 g: Sodium, Na 563 mg; 1 tablespoon 15 g: 84.5 mg; 1 individual container 70 g: 394.1 mg
USDA FoodData Central survey foods (FNDDS) 2024-10-31, code 12350220 · checked 2026-09-29
odip-daily-r5-02 · food composition dataset
Onion dip, regular, FNDDS code 12350220, fdc_id 2705621, per 100 g: Energy 346 kcal; Total lipid (fat) 35.77 g; Fatty acids, total saturated 8.745 g; 1 individual container 70 g: 242.2 kcal, 25.0 g fat
USDA FoodData Central survey foods (FNDDS) 2024-10-31, code 12350220 · checked 2026-09-29
odip-daily-r5-04 · RCT (pharmacokinetics)
Consumption of the OP resulted in C(max) = 273.2 ± 93.7 ng/mL, t(max) = 2.0 ± 1.7 h, and t(1/2) = 14.8 ± 4.8 h, whereas the AP resulted in C(max) = 63.8 ± 22.4 ng/mL, t(max) = 2.9 ± 2.0 h, and t(1/2) = 65.4 ± 80.0 h.
J Agric Food Chem, 2012 · checked 2026-09-29
odip-daily-r5-05 · RCT (bioavailability)
The 24 h urinary excretion of quercetin (1.69 ± 0.79 μmol) from red onion in soup was not significantly different to that (1.17 ± 0.44 μmol) for the quercetin supplement tablet (P = 0.065, paired t-test). This means that, in practice, 166 mg of quercetin supplement would be comparable to about 10 mg of quercetin aglycone equivalents from onion.
Food Funct, 2015 · checked 2026-09-29
odip-daily-r5-08 · animal study
The intake of a peel powder-containing meal provided a significantly higher increase of plasma quercetin concentration than the peel extract, bulb powder, bulb extract, and bulb sauté containing meals at each period tested.
J Food Sci, 2015 · checked 2026-09-29
odip-daily-r5-06 · meta-analysis of RCTs
Among all the retrieved data, 14 RCTs were eligible to be included. The results of the crude analysis showed that onion supplementation significantly improved body fat percentage (BFP), low-density lipoprotein-cholesterol (LDL-c), total cholesterol (TC), high-density lipoprotein-cholesterol (HDL-c), systolic blood pressure, adiponectin, and aspartate aminotransferase (AST).
Clin Nutr ESPEN, 2023 · checked 2026-09-29
odip-daily-r5-09 · case report
32-year-old woman; 5 years previously felt nasal pruritis upon eating a red onion dip.
Headache, 2014 · checked 2026-09-29
odip-daily-r5-07 · clinical pilot study
In a glucose tolerance test, reduction in peak glucose levels by an onion meal was higher in lactose-intolerant people than in lactose-tolerant people (44.2 versus 19.3%, P=0.04).
Eur J Clin Nutr, 2016 · checked 2026-09-29

Review. Reviewed on 2026-09-29 for evidence level, dose and population context, and claims a reader could misread. Bioma Learn has no human medical reviewer at this time, and we say so rather than invent one. Methodology. This is information, not medical advice.