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Skim milk: what taking the fat out changes, and what it leaves alone

In one small trial, taking the fat out of milk changed little in the blood. In a randomized crossover trial, 17 healthy adults drank half a liter a day of skim milk (0.1% fat) or whole milk (3.5% fat) for 3 weeks each. LDL cholesterol, triglycerides, glucose and insulin came out no different between the two, in a trial that was small, short and did not test energy balance, where the lower calories of skim milk matter. Whole milk raised HDL cholesterol more. What stays in the glass is easier to pin down. In 12 USDA samples of plain US skim milk, calcium ran from 118 to 153 mg per 3.5 oz (100 g), and the reference record gives 0.58 mcg of vitamin B12. The UK food tables, a second and independent measurement rather than a truer one, list 34 calories, 0.3 g of fat and 3.5 g of protein per 3.5 oz (100 g). A cup, the standard US serving, weighs 8.6 oz (244 g). In a single-dose trial in 19 adults drinking 15 fl oz (430 ml), vitamin A added to skim milk was absorbed at a similar rate to vitamin A in whole milk.

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 →

We have no USDA entry for skim milk itself in this cohort. The evidence below stands on published studies rather than on a composition table, and we would rather say that than show you a number for something else.

How much is actually in it

What a real portion looks like

What your body absorbs

What it does to your health

Safety, limits and interactions

What people believe that the data does not support

Who this works differently for

What is still unknown

The bottom line

The rest of the health story is mostly observational, and each finding carries its own limits. Two pooled analyses tie skim milk to acne. In one, the highest intake came with 1.82 times the odds of acne against the lowest (95% CI 1.34 to 2.47). In the other, covering 78,529 people aged 7 to 30, low-fat or skim milk came with 1.32 times the odds against no milk (1.16 to 1.52), and its authors report publication bias. These are odds from observational data, so they show a link and cannot show that the milk causes the spots. For breast cancer the signal points the other way and is weak. Premenopausal women with more skim milk had a relative risk of 0.86 (0.76 to 0.97) in a 2025 pooled analysis, a subgroup result. Across 46 prospective studies the figure was 0.93, with an upper limit of 1.00 that sits right at no effect. The same 2025 analysis tied total milk to more estrogen receptor negative breast cancer, a relative risk of 1.31. A review of 15 prospective studies links high intakes of low-fat and skim milk to a later natural menopause, and its authors call the evidence controversial. Two small trials measured skim milk directly. In 14 overweight adults with type 2 diabetes on a calorie-cut diet, about 1200 mg of calcium a day, including 3 servings of skim milk, lowered blood advanced glycation end products over 12 weeks. That comes from a secondary analysis whose abstract gives no size for the drop. When 10 young men drank a liter of water as skim milk or a sweetened soya drink, they passed about the same urine over 3 hours, 986 g against 950 g, and the trial had no plain water arm. On labels, skim is simply the legal US word for fat free milk. The EU refused to let a fermented skim milk product claim that it supports immune defense in young children, which means the evidence fell short at assessment. We have no card on allergy, medicines or pregnancy for skim milk, so this page cannot tell you who should be careful. Children deserve a separate note. The acne data reach down to age 7, and the USDA 2024 evidence review found no trial at all comparing skim with higher fat milk for growth or obesity in children, only 11 cohort studies that grouped milk fat in different ways. Trials have not settled which milk fat level is better for a child's weight, and this page has no card on infants or toddlers, so it says nothing about milk for children under 2.

Questions about skim milk, answered from the trials

Related foods

Sources

  1. skmk-r7-01 · USDA FoodData Central Foundation Foods, dataset
    Milk, nonfat, fluid, with added vitamin A and vitamin D (fat free or skim) (FDC 746776, Foundation, Dairy and Egg Products): vitamin B12 0.58 ug per 100 g = 24% DV, range across 5 records 0.38-0.58, Foundation samples 0.44-0.72 n=12; calcium 132 mg = 10% DV, range 122-204, samples 118-153 n=12; riboflavin 0.131 mg = 10% DV, range 0.131-0.194
    USDA FoodData Central, Foundation Foods, FDC 746776 · checked 2026-09-29
  2. skmk-r7-02 · CoFID 2021, dataset
    CoFID 12-307 Milk, skimmed, pasteurised, average (BAE): Energy 34 kcal; Fat 0.3 g; Satd FA 0.13 g; Protein 3.5 g; Lactose 4.8 g; Calcium 125 mg; Iodine 30 ug; Riboflavin 0.22 mg; Potassium 162 mg; Sodium 44 mg per 100 g
    CoFID 2021, Public Health England, code 12-307 (OGL v3.0) · checked 2026-09-29
  3. skmk-r7-16 · regulation
    in the case of milk products, “skim” may be used on the label or in labeling of foods, provided that:
    21 CFR 101.62, Nutrient content claims for fat, fatty acid, and cholesterol content of foods · checked 2026-09-29
  4. skmk-r7-03 · FNDDS, dataset
    Milk, fat free (skim) (FNDDS 11113000, fdc_id 2705388, WWEIA Milk, nonfat): 1 cup = 244 g; 1 fl oz = 30 g; 1 individual school container = 244 g; Quantity not specified = 244 g
    USDA FNDDS, Milk, fat free (skim), FDC 2705388 · checked 2026-09-29
  5. skmk-r7-04 · randomized crossover trial
    Nineteen volunteers (10 women and 9 men) ingested 430 ml of each milk on different days. ... The percent relative absorption of vitamin A did not differ among the three types of milk.
    Eur J Nutr, 2006 · checked 2026-09-29
  6. ev-skmc-01 · RCT
    There were no significant differences between whole milk and skimmed milk in effects on total and LDL cholesterol, triacylglycerol, insulin, and glucose concentrations.
    Eur J Clin Nutr, 2018 · checked 2026-10-07
  7. ev-skmc-02 · network meta-analysis
    We observed no detrimental effects of a high-dairy (irrespective of fat content), low-fat dairy, or full-fat dairy diet over a control group (low in dairy) on LDL cholesterol, HDL cholesterol, and triglycerides (low certainty)
    Advances in Nutrition, 2023, Effects of Dairy Intake on Markers of Cardiometabolic Health in Adults: A Systematic Review with Network Meta-Analysis · checked 2026-10-07
  8. ev-skmc-03 · meta-analysis
    Results were similar for studies with low-fat and whole-fat dairy interventions.
    PLoS One, 2013 · checked 2026-10-07
  9. ev-skmc-06 · RCT
    In healthy volunteers, dietary advice to change dairy intake for 1 month did not have a clinically significant effect on cardio-metabolic risk factors.
    Eur J Prev Cardiol, 2014 · checked 2026-10-07
  10. ev-skmc-08 · network meta-analysis
    Safflower, sunflower, rapeseed, flaxseed, corn, olive, soybean, palm, and coconut oil as well beef fat were more effective in reducing LDL-C (-0.42 to -0.23 mmol/l) as compared with butter.
    J Lipid Res, 2018 · checked 2026-10-07
  11. ev-skmc-09 · RCT
    In conclusion, these results indicate that replacing cow’s milk with oat drink may lead to modest reductions in total and LDL‑cholesterol over four weeks in healthy young women under real-world conditions.
    Nutr J, 2026 · checked 2026-10-07
  12. skmk-r7-07 · randomized crossover trial
    Total urine mass (MILK, 986 ± 254 g; SOYA, 950 ± 248 g; P = 0.435) and urine specific gravity (P = 0.156) did not differ between trials.
    Eur J Appl Physiol, 2024 · checked 2026-09-29
  13. skmk-r7-11 · meta-analysis of observational studies
    0.93 (95% CI 0.85-1.00, I² = 40.1%) for skim milk ... and skim milk (RR: 0.96; 95% CI 0.92-1.00, I² = 11.9%)
    Nutrients, 2016 · checked 2026-09-29
  14. ev-skmc-10 · meta-analysis
    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 2026-10-07
  15. ev-skmc-11 · systematic review
    Most evidence indicated that consumption of whole-fat dairy was not associated with increased cardiometabolic risk, although a change from whole-fat to reduced-fat dairy improved outcomes for some risk factors in 1 study.
    Adv Nutr, 2020 · checked 2026-10-07
  16. ev-skmc-14 · agency position
    Full-fat dairy products are important for children to help meet energy needs and support brain development.
    Dietary Guidelines for Americans, 2025-2030 (HHS, USDA), January 2026 · checked 2026-10-07
  17. ev-skmc-15 · agency position
    In general, saturated fat consumption should not exceed 10% of total daily calories.
    Dietary Guidelines for Americans, 2025-2030 (HHS, USDA), January 2026 · checked 2026-10-07
  18. ev-skmc-16 · agency guideline
    WHO recommends that adults and children reduce saturated fatty acid intake to 10% of total energy intake (strong recommendation).
    WHO, 2023, Saturated fatty acid and trans-fatty acid intake for adults and children: WHO guideline · checked 2026-10-07
  19. ev-skmc-12 · expert position
    choose healthy sources of protein (mostly plants; regular intake of fish and seafood; low-fat or fat-free dairy products; and if meat or poultry is desired, choose lean cuts and unprocessed forms)
    Circulation, 2021, 2021 Dietary Guidance to Improve Cardiovascular Health: A Scientific Statement From the American Heart Association · checked 2026-10-07
  20. ev-skmc-13 · agency position
    When consuming dairy, include full-fat dairy with no added sugars.
    Dietary Guidelines for Americans, 2025-2030 (HHS, USDA), January 2026 · checked 2026-10-07
  21. skmk-r7-05 · randomized crossover trial
    Whole milk increased HDL cholesterol concentrations significantly compared to skimmed milk (P < 0.05). There were no significant differences between whole milk and skimmed milk in effects on total and LDL cholesterol, triacylglycerol, insulin, and glucose concentrations.
    Eur J Clin Nutr, 2018 · checked 2026-09-29
  22. skmk-r7-17 · EU claims register entry
    POL-HC-8501 ‘Nutrimune®’ (a pasteurised cow's skim milk fermented with Lactobacillus paracasei CBA L74) ‘Nutrimune®’ supports the immune defence in the gastrointestinal and upper respiratory tract of young children -/- Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-8501, snapshot 2026-09-21 · checked 2026-09-29
  23. ev-skmc-04 · RCT
    In men and women with metabolic syndrome, a diet rich in full-fat dairy had no effects on fasting lipid profile or blood pressure compared with diets limited in dairy or rich in low-fat dairy.
    Am J Clin Nutr, 2021 · checked 2026-10-07
  24. ev-skmc-05 · RCT
    These data suggest that short-term consumption of low fat milk in the context of a prudent NCEP diet has no favorable nor deleterious effect on cardiometabolic risk factors associated with MetS in postmenopausal women with abdominal obesity.
    Nutr J, 2015 · checked 2026-10-07
  25. ev-skmc-07 · RCT
    The RO diet, but not the DF diet, reduced the levels of serum cholesterol (-17%), triglycerides (-20%) and low-density lipoprotein cholesterol (-17%), cholesterol/high-density lipoprotein (HDL) cholesterol ratio (-21%), apolipoprotein (apo) B/apo A-I ratio (-4%) and factor VII coagulant activity (FVIIc) (-5%) from baseline.
    J Intern Med, 2011 · checked 2026-10-07
  26. skmk-r7-06 · randomized crossover trial, secondary analysis
    Consumption of approximately 1200 mg/day of calcium (3 servings of skim milk) reduced serum AGEs concentrations and the AGE/sRAGE ratio in individuals with diabetes.
    Nutr Res, 2024 · checked 2026-09-29
  27. skmk-r7-08 · meta-analysis of observational studies
    Highest compared with lowest category of dairy (OR: 2.61, 95% CI: 1.20 to 5.67), total milk (OR: 1.48, 95% CI: 1.31 to 1.66), low-fat milk (OR: 1.25, 95% CI: 1.10 to 1.43) and skim milk (OR: 1.82, 95% CI: 1.34 to 2.47) intake significantly was associated with the presence of acne.
    Clin Nutr, 2019 · checked 2026-09-29
  28. skmk-r7-09 · meta-analysis of observational studies
    1.32 (1.16⁻1.52; p = 4.33 × 10-5) for low-fat/skim milk
    Nutrients, 2018 · checked 2026-09-29
  29. skmk-r7-10 · meta-analysis of observational studies
    especially in premenopausal women (skimmed milk, RR = 0.86, 95% CI: 0.76-0.97, I2 = 0%)
    Nutr Res, 2025 · checked 2026-09-29
  30. skmk-r7-12 · prospective cohort study
    Post-diagnosis skim milk intake may reduce mortality and extend life expectancy in cancer patients, whereas whole and 2% fat milk intake may have adverse effects.
    Eur J Nutr, 2026 · checked 2026-09-29
  31. skmk-r7-13 · meta-analysis of observational data
    eight foods were associated with reduced serum urate levels (eggs, peanuts, cold cereal, skim milk, cheese, brown bread, margarine, and non-citrus fruits) in the male, female, or full cohorts
    BMJ, 2018 · checked 2026-09-29
  32. skmk-r7-14 · meta-analysis of observational studies
    high intakes of some dairy products, such as low-fat, skimmed milk, and low intake of alcohol were associated with a later onset
    Maturitas, 2022 · checked 2026-09-29
  33. skmk-r7-15 · government systematic review
    No trials were available that directly compared the effects of different levels of fat in milk on growth, body composition, or risk of obesity outcomes. However, 11 PCS examined intake of milk stratified by fat content.
    USDA Nutrition Evidence Systematic Review, Dairy Milk and Milk Alternatives and Growth, Body Composition, and Risk of Obesity, 2024 · 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.