Filmjölk
RegionalSweden and other Nordic countries
A traditional Swedish cultured sour milk produced through mesophilic fermentation and commonly eaten as a breakfast food.
About Filmjölk
Filmjölk (pronounced "FILM-yulk") is a traditional Swedish fermented milk product with a long history in Scandinavian dairy culture. It is produced by fermenting whole milk with a mesophilic starter culture — bacteria that ferment at room temperature (around 18–20°C), unlike the thermophilic cultures used to make yogurt which require warm incubation. The result is a mildly sour, slightly viscous cultured milk product with a flavour that is less tangy than yogurt and a texture that is pourable rather than thick.
Filmjölk is produced using Lactococcus lactis strains alongside Leuconostoc mesenteroides, which produce diacetyl — a compound responsible for a subtle buttery aroma that distinguishes filmjölk from other fermented milks. Some varieties also contain Lactobacillus strains that contribute additional flavour complexity. The fermentation takes approximately 24 hours at room temperature, making it traditionally straightforward to produce at home without specialised equipment.
Filmjölk is one of the most consumed dairy products in Sweden, where it is consumed daily by a large proportion of the population for breakfast and as a snack. It is sold in Swedish supermarkets in a wide range of fat percentages, from full-fat to low-fat, as well as in flavoured varieties. Outside Scandinavia it is rarely available, though it is produced and sold in parts of Finland (as piimä) and other Nordic countries under similar names. Swedish immigrants brought filmjölk culture to parts of the United States and Canada.
Sources & Further Reading
- Codex Alimentarius — Standard for Fermented Milks — International food standard CXS 243-2003 (amended through 2024) — covers fermented milks generally; filmjölk falls within the mesophilic cultured milk category but is not individually named in the standard
- PubMed — Filmjölk Fermentation on Production Scale — Study of industrial yogurt and filmjölk fermentation, including process monitoring of filmjölk.
Nutrition
Filmjölk nutrition is similar to other fermented whole milks. For full-fat filmjölk (240ml / 1 cup):
Calories~150 kcal (full fat)
Fat~3–8% (varies by type)
Protein~3–4 g per 100ml
LactoseReduced by fermentation
CalciumGood source
Live culturesPresent
Filmjölk is a good source of calcium, protein, and B vitamins. Fermentation reduces the lactose content somewhat compared to fresh milk. It contains live lactic acid bacteria at the time of consumption. Its mild flavour and easy digestibility make it popular as an everyday food for people of all ages.
Common Uses
◌ Drinking◌ Breakfast with cereal◌ With crispbread◌ Baking◌ Pancakes
In Sweden, filmjölk is most commonly poured over cereals, müsli (muesli), or cornflakes at breakfast, or eaten with crispbread and jam as a snack. It is also drunk directly from a glass. In Swedish baking, filmjölk plays a similar role to buttermilk in American baking — its acidity reacts with bicarbonate to leaven pancakes (plättar), scones, and quick breads. Outside Scandinavia, it is primarily made at home by fermentation enthusiasts using imported or preserved starter cultures.
Interesting Facts
- Filmjölk ferments at room temperature, making it one of the simplest fermented dairy products to make at home — no heating or yogurt maker required.
- The bacteria in filmjölk produce diacetyl, the same compound responsible for the buttery flavour in microwave popcorn and many cultured dairy products.
- Sweden has one of the highest per-capita consumptions of fermented dairy products in the world, with filmjölk being a significant part of daily dietary culture.
- Filmjölk culture can be maintained at home like a sourdough starter — a spoonful from each batch is used to inoculate the next, allowing families to maintain cultures for years.
- Related Nordic ropy fermented milks made with mesophilic cultures include Finnish viili (which has an additional stretchy gel texture from Geotrichum candidum mould) and Norwegian tettemelk. Icelandic skyr is a different Nordic fermented dairy tradition — it uses thermophilic starter cultures (including Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus, similar to yogurt) and whey is removed after fermentation, making it technically closer to a fresh acid-set cheese than a ropy cultured milk.