Balanced diet should contain 12% of proteins, 25% of fats and 63% of carbohydrates.

In a balanced diet of 2600 calories, $12 \%$ is protein.

$\therefore$ Amount of protein in food intake $=12 \%$ of 2600

$=\frac{12}{100} \times 2600$

$=312$

Similarly, a balanced diet contain $s 25 \%$ fats.

$\therefore$ Amount of fats in food intake $=25 \%$ of 2600

$=\frac{25}{100} \times 2600$

$=650$

Similarly, a balanced diet contains $63 \%$ carbohydrates.

$\therefore$ Amount of carbohydrates in food intake $=63 \%$ of 2600

$=\frac{63}{100} \times 2600$

$=1638$