QUICK ANSWER
How many calories are in kefir?
Kefir provides 43 calories per 100 g in the selected USDA record for “Kefir, lowfat, plain, LIFEWAY.” The same weight contains 3.79 g protein, 4.77 g carbohydrate, 1.02 g fat and 0 g fibre. By calculated energy contribution, carbohydrate is the leading macronutrient in this record.
THE SOURCE NUMBERS
Kefir nutrition facts per 100 g
The five core values below come from USDA FoodData Central record 170904. They share the same 100 g edible-portion basis, so the calorie and macronutrient figures remain internally consistent.
CALCULATED PORTIONS
Calories at different gram weights
These are transparent calculations from the 43-kcal-per-100-g record—not claims that a spoon, piece or cup always weighs the same amount.
MACRO PROFILE
What the carbohydrate, protein and fat values mean
Carbohydrate is reported for the selected kefir, lowfat, plain, lifeway record. Fibre is included within total carbohydrate where the source reports it.
This is the protein amount in 100 g of the selected edible state. It should be compared with foods on the same weight basis.
Fat content can shift when oil, skin, sauces, draining, roasting or recipe ingredients differ from the reference description.
The selected record reports no measurable fibre. Fibre values remain specific to this food state.
ONE CANONICAL FOOD PAGE
Reference state and related variants
Dairy and egg records can vary by fat level, fortification, processing, cooking and brand formulation. This page anchors its calculations to one selected record so unlike states are not silently mixed.
Kefir, lowfat, plain, LIFEWAY
Chosen as the most common form of this food with all five core values: calories, protein, carbohydrate, fat and fibre.
SR Legacy · FDC 170904- Kefir, lowfat, plain, LIFEWAY
- Kefir, lowfat, strawberry, LIFEWAY
BETTER FOOD LOGGING
How to use this number accurately
- Match the state.Use this page only when “Kefir, lowfat, plain, LIFEWAY” is a reasonable match for what was eaten.
- Use edible grams.Exclude bones, pits, shells, packaging and discarded liquid unless the source description includes them.
- Calculate the portion.Multiply edible grams by 0.4 to estimate calories from this exact record.
- Add recipe ingredients.Oil, sauces, breading, sweeteners, toppings and preparation losses require a recipe or separate entries.
RELATED GUIDES
Continue through the food library
SOURCE & EVIDENCE BOUNDARY
Where the nutrition values come from
Core nutrition values use USDA FoodData Central record 170904: “Kefir, lowfat, plain, LIFEWAY.” The record type is SR Legacy, and values are shown per 100 g edible portion.
Nutrition databases describe reference samples. Natural variation, formulation, preparation and measurement can change an individual serving. This page provides general nutrition information, not medical advice or a food-safety duration.