In a person doing heavy work what rises is the amount of energy, not the percentage shares of the macronutrients. In the intake table Türkiye Beslenme Rehberi (TÜBER), Türkiye's national dietary guideline, gives for workers, carbohydrate is given as 45-60 percent of total energy, protein as 10-20 percent and total fat as 20-35 percent. These three ranges are the same as the general adult recommendations. The only thing that changes is this: the same percentages are applied to a larger energy base and their gram equivalents grow.
What else does the table say?
The sub-items are defined in the same table. For dietary fiber the measure is tied to energy: 14 grams for every 1000 calories. Free sugars should be kept below 10 percent of total energy and should be consumed as little as possible.
On the fat side saturated fatty acid is given as below 10 percent of total energy, and polyunsaturated fatty acid in the 6-12 percent range. For n-6 fatty acids the range is 5-10 percent, and for n-3 fatty acids 0.6-1.2 percent. On the trans fatty acid line there is no number; its consumption is not recommended.
What happens when energy rises?
Once the percentages stay fixed, their gram equivalents grow along with the energy. In the example the guideline gives, for a worker whose daily energy requirement is 3500 calories and who generally works 8 hours on their feet, the meal given at the workplace is 1750 calories, that is half of daily energy.
The food groups of that meal are given in grams as well: 125 grams from meat, chicken, fish, eggs and dried legumes; 225 grams of bread; 75 grams of bulgur, rice, pasta and flour; 250 grams of fresh vegetables and fruit; 250 grams of milk and yogurt; 50 grams of fat, half solid and half liquid; and 50 grams of sweet items such as sugar, honey and pekmez, which is grape molasses.
The reason on the protein side
The guideline states that workers' protein requirement rises in parallel with the rising energy requirement. The reason is muscle tissue: in heavy work the rate of wear and tear in the body's muscles is very high, and dietary protein matters for repairing muscle structure.
There is a critical link here. In the guideline's words, when dietary energy is taken in adequately proteins are not used as an energy source for the movement of muscles. That is, when the carbohydrate and fat shares are not filled, protein cannot do its own job.
Fluid and meal order
The measure given for fluid in the table is tied to energy as well: one liter for every 1000 calories. There is one more measure in the text: at least 10-12 glasses of water a day. Fluid intake should be provided without looking to the feeling of thirst. The guideline writes the reason too: it is known from research in different lines of work that workers do not consume enough fluid, and that this is linked with workplace accidents, occupational diseases and falling work performance.
In the meal order the guideline warns against piling into one meal. People working in heavy and dangerous jobs should not load the rising energy onto a single meal, and should eat at least one snack at the workplace in addition to their main meals. In this way both overloading at the midday meal is prevented, and the problems that can arise in workers who come to work with no breakfast, or with a poor one, are prevented.
What is asked on the fat side?
The guideline links fat with work productivity: because of their high energy content and their role in carrying the fat-soluble vitamins, fats must have a place in workers' nutrition. Amount and type matter together.
The order in which the energy source is used is described as well. When workers are physically active they use carbohydrates first to provide energy; as the duration of the work lengthens the use of fats as an energy source comes into play. This explains why the carbohydrate share is the largest share.
The two rules on the kitchen side are short: frying in fat should not be given too much room in dishes, and fats should be added to the dish without being burned. That half of the 50 grams of fat in the meal table is solid and half liquid builds the same balance.
Where does it turn into a mistake?
The first mistake is meeting the rising energy only from fat or only from sugar; because the percentage ranges do not change, the three macros grow together. The second mistake is squeezing the daily energy into the midday meal. The third mistake is drinking fluid only when thirst comes; in the table fluid too stands as an item tied to energy. The fourth mistake is taking the gram values in the meal table as fixed for every line of work: that list is built over a requirement of 3500 calories and changes along with the energy.
In the choice of fluid the guideline makes a distinction by the temperature of the environment: if it is hot, ayran, a salted yogurt drink, along with milk, mineral water, lemonade, cold tea and fruit; if it is cold, pekmez, syrup, şerbet, tea and fruit are recommended. Sugary drinks, energy drinks, caffeine and alcohol intake are limited.
This content has been prepared to support general nutrition literacy; it does not take the place of medical diagnosis or treatment and does not carry the character of personal nutrition advice. A personalized plan is prepared only by a qualified dietitian; if there is pregnancy, chronic illness, regular medication use, child nutrition or a clinical condition, supervision by a doctor and a dietitian is required before starting a plan.