|Protein-Energy Requirements of Developing Countries: Evaluation of New Data (UNU, 1981, 268 p.)|
|Obligatory nitrogen losses-adults|
|Obligatory nitrogen losses of adult Thai males|
Four male adult Thais 21 to 25 years old. Their body weights were 45 to 67.5 kg, and their heights were 164.5 to 169 cm. They were healthy and well-nourished, based on medical history, physical examination, urinalysis, stool examination, chest x-ray, and a routine complete blood count.
2. Study Environment
The entire study was conducted at the clinical research ward (a metabolic unit) in
Ramathibodi Hospital. The climatic characteristics were those of tropical countries.
3. Physical Activity
The subjects were allowed to continue their usual activities but were not allowed to participate in competitive, active sports.
4. Duration of the Study
The study of obligatory nitrogen losses was carried out over a 14-day period.
TABLE 1. Composition of the Protein-Free Diet
|Mung bean starch||100.4|
|Mung bean noodles||100.0|
The composition of the protein-free meal is shown in table 1. The subjects were given four meals per day at 7.30 a.m., 12 noon, 5.00 p.m., and 9.30 p.m. Daily energy intakes were constant, at about 45 kcal/kg/day. Fat provided approximately 30 per cent of the daily energy intake. Multivitamin and mineral tablets were given twice each day. Water was offered ad libitum but the volume was recorded daily.
6. Indicators and Measurements
TABLE 2. Obligatory Nitrogen Losses in Four Adult Thai Males
|Mean ± S.D.||34.9 ± 2.7||12.6 ± 1.9||5 ± 10||52.5 ± 4.2|
U = urinary nitrogen losses, average from the last 5 days of 14-day dietary period.
F = faecal nitrogen losses, average from the last 10 days.
S = skin and other minor route nitrogen losses, taken from FAD/WHO.