Milk shake: a sugary milk drink that research rarely studies as drunk

The strongest evidence near a milkshake comes from children and is about a swap. In a meta-analysis of trials, replacing sugar-sweetened drinks with non-caloric drinks or flavored milk lowered body fat by 0.70 percentage points (95% CI 0.62 to 0.78), pooled from only 3 trials, and BMI z-score did not change. Flavored milk was standing in for soda there, so this gives no reason to add a shake to the day. The shake itself is mostly sugar and milk. A thick chocolate shake in the USDA table has 119 calories and 20.9 g of sugars per 3.5 oz (100 g), and US diet surveys weigh a medium fast-food chocolate shake at 526 g. At the USDA thick-shake value that comes to about 626 calories and 110 g of sugars, a calculation and not a measured product. A home-made 10 fl oz shake weighs 9.9 oz (280 g).

The numbers, per 3.5 oz (100 g)

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

How much is actually in it

• A thick chocolate milkshake has about 119 calories and 20.9 g of sugars per 3.5 oz (100 g), and a thick vanilla one 112 calories and 17.8 g, with about 130 to 150 mg of calcium. — USDA SR Legacy records Milk shakes, thick chocolate (FDC 170883) and thick vanilla (FDC 170884) Evidence E source
  Chocolate: 119 calories, sugars 20.85 g, fat 2.7 g, protein 3.05 g, calcium 132 mg; vanilla: 112 calories, sugars 17.75 g, fat 3.03 g, protein 3.86 g, calcium 146 mg, B12 0.52 ug per 3.5 oz (100 g)
• Milkshake powder is 98.3% sugar by weight, so a UK shake made up with whole milk has 11.1 g of sugars per 3.5 oz (100 g) against 3.5 g of fat. — CoFID 2021 codes 17-733 (milk shake powder), 12-591 (made up with whole milk), 12-590 (made up with skim milk) Evidence E source
  Powder: 388 calories, sugars 98.3 g per 3.5 oz (100 g); with whole milk: 86 calories, sugars 11.1 g, fat 3.5 g, calcium 112 mg; with skim milk: 59 calories, sugars 11.3 g, fat 0.3 g, calcium 117 mg
• Among US girls aged 12 to 18, flavored-milk drinkers got about 992 mg of calcium a day against 576 mg in girls who drank no milk. — 7,557 children and adolescents aged 2 to 18 years, NHANES 1999-2002 (n = 7557) Evidence C source
  Calcium 992 mg/day flavored milk drinkers vs 1,038 plain-only vs 576 non-drinkers (girls 12-18)

What a real portion looks like

• US dietary surveys weigh a fast-food chocolate shake at 405 g small, 526 g medium and 690 g large, against 280 g for a 10 fl oz home-made one. — FNDDS portions for Milk shake, fast food, chocolate (FDC 2705508) and Milk shake, home recipe (FDC 2705504) Evidence E source
  Fast food: small 405 g, medium 526 g, large 690 g; home recipe: 1 milkshake (10 fl oz) 280 g

What your body absorbs

• Children absorbed only 1.6% of the iron from a fortified chocolate milk drink, rising to 5.1% when 25 mg of vitamin C was added. — 20 Jamaican children aged 6-7 years, stable-isotope crossover (n = 20) Evidence C source
  Geometric mean iron absorption 1.6% without and 5.1% with 25 mg ascorbic acid (P < 0.0001); 5.4% vs 7.7% for 25 vs 50 mg
• In 38 older adults, a 300 calories high-protein milkshake slowed gastric emptying compared with a low-protein one but did not reduce food eaten 3 hours later. — 19 active and 19 less active older adults, single-blind randomized crossover, 8.5 fl oz (250 ml) 300 calories preloads with 57% vs 17% energy as protein (n = 38) Evidence B source
  Gastric emptying half time longer after high-protein shake; no effect on later energy intake or appetite

What it does to your health

• In 20 older and 20 younger adults, 300 calories milkshakes high in protein, fat or carbohydrate did not change how much they ate 3 hours later, although older adults emptied the stomach faster. — 20 older and 20 younger adults, single-blinded randomized crossover, three 8.5 fl oz (250 ml) preload milkshakes of about 300 calories (n = 40) Evidence B source
  No significant effect of preload type or age on energy intake or appetite; gastric emptying latency shorter in older adults
• In a meta-analysis of trials in children, swapping sugar-sweetened drinks for non-caloric drinks or flavored milk lowered body fat by 0.70 percentage points without changing BMI z-score. — Children and adolescents in 16 RCTs; the beverage swap comparison pooled 3 trials (n = 16 RCTs) Evidence A source
  Body fat % MD -0.70 (95% CI -0.78 to -0.62), n = 3 trials; BMI z-score MD -0.05 (-0.20 to 0.09), n = 2

Safety, limits and interactions

• A hospital milkshake machine stayed contaminated with Listeria for a year despite cleaning and caused a case of hospital-acquired listeriosis. — One hospitalized patient; commercial-grade shake freezer machine (n = 1) Evidence D source
  One listeriosis case linked molecularly to a strain found a year earlier in ice cream at the same hospital
• A 17-year-old developed vitamin D poisoning with blood calcium of 15.5 mg/dL after a year of home-made milkshakes spiked with about 14,000 units of vitamin D3 per 16 oz. — One 17-year-old male (n = 1) Evidence D source
  Calcium 15.5 mg/dL, 25-hydroxyvitamin D 594 ng/mL; resolved with fluids and low calcium diet

What people believe that the data does not support

• When 46 people drank the same 380 calories milkshake labeled either 620 calories 'indulgent' or 140 calories 'sensible', hunger hormone ghrelin fell far more steeply after the 'indulgent' label. — 46 participants tested on 2 separate occasions with the same shake under two misleading labels (n = 46) Evidence C source
  Dramatically steeper ghrelin decline after 'indulgent' label; flat response after 'sensible' label; satiety matched belief

What is still unknown

• A systematic review of 13 studies in children found that flavored milk raised total milk intake in 11 and energy intake in 5 of 7, and called for more data before judging its health role. — Children aged 1 to 18 years in 13 studies (10 experimental, 3 cohorts, 1 RCT) (n = 13 studies) Evidence C source
  Milk intake up in 11 of 13; energy intake up in 5 of 7; weight gain up in 1 of 3

The bottom line

The thick vanilla version has 112 calories and 17.8 g of sugars per 3.5 oz (100 g), with about 130 to 150 mg of calcium in either flavor. UK milkshake powder is 98.3% sugar by weight. Made up with whole milk it gives 11.1 g of sugars and 3.5 g of fat per 3.5 oz (100 g), and with skim milk the sugar stays at 11.3 g while fat drops to 0.3 g. On fullness, lab trials used shakes as a test meal. In 20 older and 20 younger adults, 300 calories shakes high in protein, fat or carbohydrate did not change how much people ate 3 hours later. In 38 older adults a high-protein 300 calories shake emptied from the stomach more slowly than a low-protein one and still did not cut later intake. In one study, 46 people drank the same 380 calories shake twice, labeled once as a 620 calories treat and once as a 140 calories light drink. Ghrelin, a hunger hormone, fell much more steeply after the indulgent label. It was a single small lab study, and later attempts to repeat the label effect gave mixed results. In 20 Jamaican children aged 6 to 7, only 1.6% of the iron in a fortified chocolate milk drink was absorbed, and 5.1% once 25 mg of vitamin C was added. US girls aged 12 to 18 who drank flavored milk got about 992 mg of calcium a day, against 1,038 mg in plain milk drinkers and 576 mg in girls who drank no milk. Those are one-day recalls, and flavored milk is thinner than a thick shake. What stays open. A review of 13 studies in children found flavored milk raised total milk intake in 11 and energy intake in 5 of 7, and weight gain in 1 of 3. Only one of those studies was a randomized trial, most had high risk of bias, and over half were industry-funded or did not say. We found no trial or cohort of shakes as people actually buy them. Who should take care. A hospital shake machine stayed contaminated with Listeria for a year despite repeated cleaning and gave one patient listeriosis. That single case matters most for pregnant, elderly and immunocompromised people drinking soft-serve shakes. A 17-year-old reached a blood calcium of 15.5 mg/dL after a year of home-made shakes spiked with about 14,000 units of vitamin D3 per 16 oz, drunk at 16 oz a day, which was supplement misuse. We have no card on milk allergy, lactose or medicines for shakes.

Sources

1. mlks-r2-01 · food composition dataset
   Milk shakes, thick chocolate (FDC 170883, SR Legacy): energy 119 kcal, sugars 20.85 g, fat 2.7 g, protein 3.05 g, calcium 132 mg per 100 g; Milk shakes, thick vanilla (FDC 170884): energy 112 kcal, sugars 17.75 g, fat 3.03 g, protein 3.86 g, calcium 146 mg, vitamin B12 0.52 ug
   USDA FoodData Central, SR Legacy, FDC 170883 and 170884 · checked 2026-09-29
2. mlks-r2-02 · food composition dataset
   Milk shake, powder (17-733): Energy 388 kcal, Total sugars 98.3 g, Calcium 8 mg; Milk shake, powder, made up with whole milk (12-591): Energy 86 kcal, Total sugars 11.1 g, Fat 3.5 g, Calcium 112 mg; made up with skimmed milk (12-590): Energy 59 kcal, Total sugars 11.3 g, Fat 0.3 g, Calcium 117 mg
   CoFID 2021, Public Health England, OGL v3.0, codes 17-733, 12-590, 12-591 · checked 2026-09-29
3. mlks-r2-09 · cross-sectional survey analysis
   The study population included 7,557 children and adolescents aged 2 to 18 years. ... Among females aged 12 to 18 years, calcium intakes by flavored and exclusively plain milk drinkers were 992+/-41.5 and 1,038+/-22.5 mg/day, respectively, whereas intake by nondrinkers was 576+/-11.7 mg/day.
   J Am Diet Assoc, 2008 · checked 2026-09-29
4. mlks-r2-03 · portion dataset
   Milk shake, fast food, chocolate (FNDDS 11542100, fdc_id 2705508): 1 small 405 g, 1 medium 526 g, 1 large 690 g; Milk shake, home recipe, flavors other than chocolate (FNDDS 11541120, fdc_id 2705504): 1 milkshake (10 fl oz) 280 g
   USDA FNDDS 2021-2023, FDC 2705508 and 2705504 · checked 2026-09-29
5. mlks-r2-04 · iron absorption study
   The influence of ascorbic acid on iron absorption from an iron-fortified, chocolate-flavored milk drink (6.3 mg total Fe per serving) was evaluated with a stable-isotope technique in 20 6-7-y-old Jamaican children. ... In the first study, iron absorption was significantly greater (P < 0.0001) after the addition of 25 mg ascorbic acid: geometric mean iron absorption was 1.6% (range: 0.9-4.2%) and 5.1% (2.2-17.3%) for the test meals containing 0 and 25 mg ascorbic acid, respectively.
   Am J Clin Nutr, 1998 · checked 2026-09-29
6. mlks-r2-05 · randomized crossover trial
   Nineteen active and 19 less active older adults completed a single-blind, randomised, crossover trial involving two test days at home. Participants received a standard breakfast, followed by an isovolumetric (250 ml) and isocaloric (∼300 kcal) high- or low-protein preload milkshake (57% versus 17% energy as protein) matched for sensory properties. ... Higher protein intake did not affect subsequent energy intake or appetite ratings in both active and less active groups. Gastric emptying half time was longer following the high-protein milkshake compared to the low-protein milkshake.
   Appetite, 2025 · checked 2026-09-29
7. mlks-r2-06 · randomized crossover trial
   Twenty older and 20 younger adults completed a single-blinded randomised crossover trial involving three study visits. Participants consumed a standard breakfast, followed by a preload milkshake high in either carbohydrate, fat, or protein. ... There was no significant effect of preload type or age on energy intake either at the ad libitum meal, self-recorded food intake for the rest of the test day or subjective appetite ratings. There was a significant effect of preload type on gastric emptying latency phase and ascension time, and an effect of age on gastric emptying latency and lag phase such that older adults had faster emptying.
   Appetite, 2023 · checked 2026-09-29
8. mlks-r2-07 · meta-analysis of randomized trials
   Sixteen RCTs met inclusion criteria. ... Substituting sugar-sweetened beverage with non-caloric beverages or flavored milk reduced body fat percentage (- 0.70 [- 0.78, - 0.62] (p < 0.001)) (n:3) but did not change BMI z-score (- 0.05 [- 0.20, 0.09] (p = 0.48)) (n:2).
   Eur J Nutr, 2023 · checked 2026-09-29
9. mlks-r2-10 · case report
   One case of hospital-acquired listeriosis was linked to milkshakes produced in a commercial-grade shake freezer machine. This machine was found to be contaminated with a strain of Listeria monocytogenes epidemiologically and molecularly linked to a contaminated pasteurized, dairy-based ice cream product at the same hospital a year earlier, despite repeated cleaning and sanitizing.
   Epidemiol Infect, 2017 · checked 2026-09-29
10. mlks-r2-11 · case report
    We describe a 17-year-old male who presented with symptomatic hypercalcemia due to prolonged, excessive ingestion of vitamin D through homemade milkshakes supplemented with vitamin D3. Case Presentation: The patient presented with abdominal pain, knee pain, and anorexia in the setting of hypercalcemia (15.5 mg/dL [8.4-10.2 mg/dL]). History revealed an intake of homemade milk shake supplemented with vitamin D (vitamin D3 14 045 units/16 ounces): 16 ounces daily for about a year and 32 ounces daily for 10 days prior to his presentation.
    AACE Endocrinol Diabetes, 2026 · checked 2026-09-29
11. mlks-r2-12 · experimental crossover study
    On 2 separate occasions, participants (n = 46) consumed a 380-calorie milkshake under the pretense that it was either a 620-calorie "indulgent" shake or a 140-calorie "sensible" shake. ... The mindset of indulgence produced a dramatically steeper decline in ghrelin after consuming the shake, whereas the mindset of sensibility produced a relatively flat ghrelin response.
    Health Psychology, 2011 · checked 2026-09-29
12. mlks-r2-08 · systematic review
    Of 3978 studies identified, 13 met inclusion criteria. Ten studies were experimental and three were longitudinal cohort studies. Eleven studies found that flavored milk increased overall milk intake, five of seven studies that examined energy intake showed that flavored milk increased energy intake, and one of three studies that assessed obesity outcomes demonstrated an increase in weight gain with flavored milk consumption. Only one study was a randomized controlled trial, most studies had high bias, and over half were industry-funded or did not disclose funding. ... More data regarding flavored milk's impact on health is needed to inform its role in sugary drink policies.
    Prev Med, 2018 · checked 2026-09-29