ABSTRACT
A nutritional survey of lactating mothers in different lactating periods was carried out in urban, suburban and rural districts of beijing in 1983-1984. Milk were collected, and its lipid compositions, including specific gravity, fat, cholesterol and fatty acids were analyzed. The results were as follows:1.The average of specific gravity of 207 milk samples were from 1.018 to 1.022. Though the value of the rural district was higher (1.022). The difference was rather small.2.216 milk samples were determined for the fat content (g%). The average of urban district was 3.78, of suburban 3.31 and of rural 3.08. Differ-eces between urban and other two districts were significant.3 .Milk cholesterol content was determined in 194 samples. The content in colostrum was the highest, 23.4mg/100g, but decreased gradually and steadied at about 10mg/100g in three months. No differece was observed among three districts.4.221 milk samples were analyzed for its fatty acid composition. The main components were oleic acid (29-37%), palmitic acid (17-25%) and lino-leic acid (12-25%), with 1-2% of erucic acid. The linoleic acid content was the highest in rural district.5.Statistical analysis showed that the correlations between milk fat and cholesterol content were significant in all the three districts, but the regression coefficient of urban district was significantly lower than that of rural district.6.There was significant correlation between fat intake of mothers and their milk fat content in total 188 samples, but no correlation was found when three districts were examined separately. All the results showed that the dietary fat intake of mothers might influence their milk fat content. The characteristics of fatty acids pattern of Chinese breast milk was the higher linoleic acid content as compared with other countries. The essential fatty acids in breast milk could meet the infant's need. The cholesterol allowance from breast milk was about 70-85mg per day.
ABSTRACT
In cooperation with a District Health Station of Beijing, 13 nurseries were selected for the study of the practice of diet planning. At the beginning, the health workers of the selected nurseries -were gathered together at the station to attend a short-term class. Lectures were given on the basic knowledge of child nutrition, the methods of dietary survey and diet planning, i.e. using the proper amount of the cheaper but more nutritive foods to make essentially balanced diets according to the RDA. The health workers of the nurseries meet and comunicate once a month at the health station to calculate the monthly food consumption and the average daily intake of the nutrients of the children in the past month and to make plan for the next month. The body weight of the children were measured every month and the height at three months intervals. The data collected in 12 months were summarized. The results indicated that the yearly average intake of most nutrients by the children increased and their collective growth level in weight and height increased correspondingly during the one year period of diet planning without any increase of the boarding expense of the children.
ABSTRACT
The effects of synthetic oil used as dietary fat source on the body weight, organ weight, liver and serum lipids of rats during the hypercho-lesterolemic inducing period were investigated, and comparison was made with lard and soybean oil diets.Weanling albino rats were fed first with stock diet for 3 weeks. Bloods were collected from tails, and serum cholesterol contents were determined. Based upon the body weight and serum cholesterol level, animals were then divided into 5 groups. Four groups were fed respectively with synthetic oil, synthetic oil plus linoleic acid, lard and soybean oil diets, all were supplemented with 1% cholesterol. The, fifth group served as control, was fed with soybean oil diet without cholesterol. Body weights and serum lipids (cholesterol and triglyceride) were measured at intervals during the experiment. Organ weights and liver lipids (total fat, cholesterol and triglyceride) were determined at the end of the experiment.The results showed that there was marked sex difference between male and female rats, that is, synthetic oil diet caused significant lower body weights and lower serum cholesterol levels to female but not to male rats.Cholesterol inducing diets apparently increased the liver weights of all animals, yet fat accumulation only occured in those livers of rats fed with lard and soybean oil diets. The liver fat contents of animals of both synthetic oil and synthetic oil plus linoleic acid groups were at normal level.This experiment reveals that when dietary cholesterol intake is high, the use of synthetic oil as a dietary fat source for maintaining a normal lipid metabolic condition in the body seems beneficial.
ABSTRACT
Weanling female rats were fed 12% lard diet supplemented with 2 g cholesterol and 60 mg cholic acid per 100 g diet for 52 days. Blood cholesterol levels were then analyzed for individual rat. Animals were divided into 4 groups according to their blood cholesterol levels and body weights. One group of animals, regarded as negative control, was killed immediately. The other 3 groups were fed 12% level of synthetic oil, lard or soybean oil diet respectively without cholesterol and cholic acid supplementation for 3 weeks. During the 3 weeks of rehabilitation, the following parameters were measured: body weight and serum cholesterol levels, every week; food intakes, every other day; high density lipoprotein cholesterol (HDL-C) levels at the beginning and the end of the rehabilitation period; fecal steroids excretion, including neutral and acid steroids from the 2nd to the 4th day of rehabilitation; liver weights, liver fat contents and liver cholesterol levels after animals were killed.The results showed that no significant effects on body weights, serum cholesterol levels, liver weights and liver fat contents of different kinds of dietary fat were observed during the rehabilitation period of hyperch-olesterolemia. But synthetic oil, as well as soybean oil diet caused a lower liver cholesterol levels, and higher levels of both serum HDL-C and fecal neutral steroids.