Low-fat quark

Low-fat quark is a fresh dairy product that is very popular in many European countries, especially Germany, Austria and Switzerland. It belongs to the large family of quark and fresh cheese products and is made from cow’s milk. The special feature of low-fat quark is its very low fat content: it typically contains less than 0.5% fat in the dry matter; often the packaging states “under 0.3% fat.” For this reason it is popular with people who want a high-protein, low-fat diet. At the same time low-fat quark is very versatile thanks to its creamy consistency and its mild, slightly tangy taste.

Origin and production – briefly and understandably
Quark is produced when milk is “acidified” with lactic acid bacteria. These friendly bacteria convert milk sugar (lactose) into lactic acid. This causes the milk protein (casein) to coagulate and a solid mass called the “gel” to form. This mass is then cut and drained in cloths or special installations so that whey (the yellowish liquid) runs off. Depending on how much fat is in the starting milk and how strongly it is drained, different quark types are produced. Low-fat quark is made from skimmed milk, i.e. milk from which the fat has been almost completely removed.

Availability in trade
In many supermarkets, discounters and organic shops, low-fat quark is available year-round. It is a so-called “fresh product” and is restocked regularly, often daily. Typical package sizes are 250 g, 500 g and 1 kg. In addition, low-fat quark is available in jars or in sustainable tubs in some organic markets. In regions where quark is less common (for example outside Central Europe), it is found mainly in well-stocked supermarkets, international delicatessen sections, or it is substituted with similar products such as skyr or low-fat Greek yogurt.

Types and varieties of quark – where low-fat quark fits in
In German-speaking areas quark is roughly distinguished according to fat content:

Low-fat quark is a fermented dairy product with a very low fat content and a high biological value of the proteins it contains. It is produced by lactic acid bacterial acidification of skimmed or very low-fat cow's milk, followed by the separation of whey. The result is a spreadable, fine-grained mass with a high dry-matter proportion of milk protein and a characteristically mild-acid aroma. In food technology, low-fat quark is regarded as a versatile matrix for sweet and savory applications, for sports nutrition–oriented products and as a texture-defining element in baking and cooking recipes.

Production and process parameters: The base is pasteurized skimmed milk (typically < 0.5% fat). By adding defined starter cultures, predominantly Lactococcus lactis strains and optionally Leuconostoc species, lactose is fermented to lactic acid. The pH drop into the range of about 4.5–4.7 leads to coagulation of the casein micelle system (isoelectric point of the caseins), producing a gel. Process variables such as fermentation temperature (usually 22–30 °C), inoculation rate, fermentation time and calcium ion content influence gel stability, syneresis and texture. After coagulation, whey is separated by centrifugation or draining, sometimes assisted by mechanical stirring. Gentle cooling stabilizes the protein network structure and reduces microstructure damage. Optionally, a homogenization step can smooth the mouthfeel.

Composition and nutrient profile: Low-fat quark is characterized by a high protein content (typically 11–14 g/100 g), dominated by casein fractions (αs-, β- and κ-caseins) with a portion of whey proteins. Fat content is generally below 0.5 g/100 g. Carbohydrates are mainly residual lactose (about 3–4 g/100 g), the amount of which depends on the degree of fermentation. Energy content is often between 60 and 75 kcal per 100 g. In terms of minerals, low-fat quark provides relevant amounts of calcium, phosphorus and