Dietary fat
Dietary fat is the most energy-dense macronutrient at about 9 kcal per gram; it is required for hormone production and the absorption of fat-soluble vitamins, and it is the item most often missed in home-cooked food logs.
Fat carries more than twice the energy of protein or carbohydrate per gram. That single fact explains why a tablespoon of oil, which is invisible once it is in a curry, costs more calories than a whole roti.
Why you cannot cut it to zero
Fat is required for absorbing vitamins A, D, E and K, for producing steroid hormones, and for the two essential fatty acids the body cannot synthesise. Very low-fat diets reliably make people feel unwell, and in women they interfere with the menstrual cycle. A practical floor for most adults is around 0.5 to 0.8 g per kilogram of bodyweight, or roughly 20 per cent of calories, whichever is higher.
Why it dominates home-cooking estimates
A restaurant dal and a home dal can use anywhere from one teaspoon to four tablespoons of oil or ghee for the same quantity of lentils. That range alone is worth 40 to 500 kcal. Anyone estimating home-cooked food who does not account for cooking fat is not making a small error.
The types, briefly
Unsaturated fats from nuts, seeds, olive oil and fish are the ones cardiovascular guidance favours. Saturated fat from ghee, butter, coconut and fatty meat is not poison but is usually recommended in moderation. Trans fats from partially hydrogenated oils are the one category worth actively avoiding.
Sources
- 1.Dietary Reference Values — European Food Safety Authority
- 2.Food energy: methods of analysis and conversion factors — Food and Agriculture Organization of the United Nations
Related reading
- How much oil is actually in your curry?
Cooking fat is the largest uncounted item in home-cooked food. Typical quantities by dish, what they cost per serving, and how to cut a third without noticing.
- Calories in ghee, butter and the tadka on top
Ghee is 126 kcal a tablespoon and disappears into food. What a daily ghee habit actually costs, and the difference between using fat well and wasting it.
- Dietary fat: the minimum, and why it has one
Fat is required for hormones and vitamin absorption, and at 9 kcal per gram it is the easiest macro to overshoot. Where the floor is and how to stay above it.
- Vegetarian protein worth the calories it costs
Ranked by calories per gram of protein, not by grams per 100 g. Which vegetarian sources are efficient, which are not, and how to build a 130 g day.