White sauce: the milk and the thickness decide the fat

A Cochrane review of long-term randomized trials found that cutting saturated fat across the whole diet lowered combined cardiovascular events by 21 percent, a risk ratio of 0.79 with a 95 percent confidence interval of 0.66 to 0.93, in 11 trials with 53,300 participants. Nobody in those trials was tested on white sauce, which is one ordinary source of saturated fat among many. The same review found little or no effect on death from any cause, a risk ratio of 0.96 with a 95 percent confidence interval of 0.90 to 1.03. How much saturated fat a white sauce carries depends on the recipe. A UK homemade sauce made with whole milk lists 158 calories and 6.8 g of saturated fat per 3.5 oz (100 g). Made with skim milk, the same recipe drops to 118 calories and 4.03 g, and calcium stays about level at 142 mg against 136 mg.

The numbers, per 3.5 oz (100 g)

How much is actually in it

• A thick homemade white sauce in the USDA reference data has 13.83 g fat, 3.416 g saturated fat and 373 mg sodium per 3.5 oz (100 g), and fat ranges from 2.56 to 13.83 g across the three USDA white sauce records. — food composition record, homemade white sauce, thick Evidence E source
  Fat 13.83 g, saturated fat 3.416 g, sodium 373 mg per 3.5 oz (100 g); across thin, medium and thick records fat 2.56-13.83 g, sodium 184-373 mg
• A savory white sauce made with whole milk has 158 calories, 10.8 g fat, 6.8 g saturated fat and 136 mg calcium per 3.5 oz (100 g) in UK data. — UK food composition record, white sauce savory, whole milk, homemade Evidence E source
  158 calories, 10.8 g fat, 6.80 g saturated fat, 4.4 g protein, 136 mg calcium, 105 mg sodium per 3.5 oz (100 g)

What a real portion looks like

• In US survey data a cup of white sauce (240 g) gives about 346 calories and 775 mg sodium, while an unspecified 2.1 oz (60 g) serving gives 86 calories and 194 mg sodium. — US survey food code, white sauce or gravy Evidence E source
  144 calories, 323 mg sodium, 4.678 g saturated fat per 3.5 oz (100 g); 1 cup 240 g; quantity not specified 60 g

What cooking and storage change

• Making the same savory white sauce with skim milk instead of whole milk lowers it to 118 calories and 4.03 g saturated fat per 3.5 oz (100 g), with calcium about the same at 142 mg against 136 mg. — UK food composition record, white sauce savory, skim milk, homemade Evidence E source
  118 vs 158 calories; 6.5 vs 10.8 g fat; 4.03 vs 6.80 g saturated fat; calcium 142 vs 136 mg per 3.5 oz (100 g)
• For milk heated about 10 minutes, as when a white sauce simmers, USDA retention factors keep 80% of vitamin B12, 85% of folate and all of the calcium and riboflavin. — USDA group factor, Dairy and Egg Products, milk heated approx 10 min Evidence E source
  B12 80%, vitamin C 85%, folate 85%, thiamin 90%, B6 90%, calcium 100%, riboflavin 100% retained

What it does to your health

• A Cochrane review of long-term RCTs found that cutting saturated fat across the whole diet lowered combined cardiovascular events by 21% (11 trials, 53,300 participants). — adults in long-term RCTs lasting at least 24 months; 11 trials for this outcome (n = 53300) Evidence A source
  RR 0.79, 95% CI 0.66 to 0.93, 11 trials, GRADE moderate

Safety, limits and interactions

• A Swiss allergy unit reported nine systemic sesame reactions, including falafel anaphylaxis where the white sauce served with it contained ground sesame. — 9 sesame-allergic patients, Zurich allergy unit, 1978-1991 (n = 9) Evidence C source
  3 anaphylactic reactions to falafel in 1991 alone

Who this works differently for

• In the same Cochrane review, 56 people without heart disease and 32 people with heart disease needed to cut saturated fat for about four years for one to avoid a cardiovascular event. — adults in primary and secondary prevention RCTs (n = 53300) Evidence A source
  NNTB 56 primary prevention, 32 secondary prevention

What is still unknown

• The same Cochrane review of RCTs found little or no effect of cutting saturated fat on all-cause death (RR 0.96) in 55,858 people. — 55,858 adults in 11 RCTs (n = 55858) Evidence A source
  RR 0.96, 95% CI 0.90 to 1.03

The bottom line

The USDA homemade records spread even wider, from 2.56 to 13.83 g of fat per 3.5 oz (100 g) between thin and thick versions, because thickness drives the fat. Sodium follows the salt in the recipe: 373 mg per 3.5 oz (100 g) in the thick USDA version against 105 mg in the UK whole milk version. In US survey data, where one code covers white sauce or gravy, a 2.1 oz (60 g) serving gives about 86 calories and 194 mg of sodium, and a full 240 g cup about 346 calories and 775 mg. Simmering costs the milk little. USDA factors for milk heated about 10 minutes keep 80 percent of vitamin B12, 85 percent of folate and all of the calcium and riboflavin. That factor was measured for milk and is applied here to the milk in the sauce. The gain from cutting saturated fat is spread thin across many people. In the Cochrane trials, 56 people without heart disease had to cut saturated fat for about four years for one of them to avoid a cardiovascular event. Among people who already had heart disease the number was 32. Both figures describe a change to the whole diet. On safety, the only card is a Swiss allergy unit series of 9 sesame-allergic patients, including anaphylaxis to falafel served with a white sauce of freshly ground sesame seeds. That is a sesame sauce with little in common with a milk and flour white sauce, and a case series is the weakest kind of evidence. We found no study on milk or wheat allergy from white sauce, and none on pregnancy, children or medicines.

Sources

1. whsc-daily-r6-01 · USDA SR Legacy dataset
   Sauce, homemade, white, thick, SR Legacy FDC 174526: Total lipid (fat) 13.83 G, Fatty acids, total saturated 3.416 G, Sodium, Na 373 MG per 100 g
   USDA FoodData Central, SR Legacy 2018, FDC 174526 (Sauce, homemade, white, thick) · checked 2026-09-30
2. whsc-daily-r6-02 · CoFID dataset
   White sauce, savoury, made with whole milk, homemade, CoFID code 17-779: Energy (kcal) 158, Fat (g) 10.8, Satd FA (g) 6.80, Protein (g) 4.4, Calcium (mg) 136, Sodium (mg) 105 per 100 g
   CoFID 2021, Public Health England, code 17-779 (White sauce, savoury, made with whole milk, homemade) · checked 2026-09-30
3. whsc-daily-r6-04 · USDA FNDDS dataset
   White sauce or gravy, fdc_id 2705703: Energy 144 KCAL, Sodium, Na 323 MG, Fatty acids, total saturated 4.678 G per 100 g; 1 cup 240 g; Quantity not specified 60 g
   USDA FNDDS 2021-2023, White sauce or gravy (FDC 2705703) · checked 2026-09-30
4. whsc-daily-r6-03 · CoFID dataset
   White sauce, savoury, made with skimmed milk, homemade, CoFID code 17-778: Energy (kcal) 118, Fat (g) 6.5, Satd FA (g) 4.03, Protein (g) 4.5, Calcium (mg) 142, Sodium (mg) 102 per 100 g
   CoFID 2021, Public Health England, code 17-778 (White sauce, savoury, made with skimmed milk, homemade) · checked 2026-09-30
5. whsc-daily-r6-05 · USDA retention factors dataset
   USDA-RETN-R6:2151 MILK,HEATED APPROX 10MIN, group Dairy and Egg Products: vitamin_b12_ug 80% retained, vitamin_c_mg 85%, folate_total_ug 85%, thiamin_mg 90%, vitamin_b6_mg 90%, calcium_mg 100%, riboflavin_mg 100%
   USDA Table of Nutrient Retention Factors, Release 6 (2007), code 2151 · checked 2026-09-30
6. whsc-daily-r6-06 · Cochrane systematic review
   The included long-term trials suggested that reducing dietary saturated fat reduced the risk of combined cardiovascular events by 21% (risk ratio (RR) 0.79; 95% confidence interval (CI) 0.66 to 0.93, 11 trials, 53,300 participants of whom 8% had a cardiovascular event, I² = 65%, GRADE moderate-quality evidence).
   Cochrane Database Syst Rev, 2020 · checked 2026-09-30
7. whsc-daily-r6-09 · case series
   It is served together with a white sauce containing freshly ground sesame seeds.
   Ann Allergy, 1993 · checked 2026-09-30
8. whsc-daily-r6-07 · Cochrane systematic review
   The number needed to treat for an additional beneficial outcome (NNTB) was 56 in primary prevention trials, so 56 people need to reduce their saturated fat intake for ~four years for one person to avoid experiencing a CVD event. In secondary prevention trials, the NNTB was 32.
   Cochrane Database Syst Rev, 2020 · checked 2026-09-30
9. whsc-daily-r6-08 · Cochrane systematic review
   We found little or no effect of reducing saturated fat on all-cause mortality (RR 0.96; 95% CI 0.90 to 1.03; 11 trials, 55,858 participants) or cardiovascular mortality (RR 0.95; 95% CI 0.80 to 1.12, 10 trials, 53,421 participants), both with GRADE moderate-quality evidence.
   Cochrane Database Syst Rev, 2020 · checked 2026-09-30