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Query: KEGG:D00046 (lactose)
 16,692 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Low-lactose milk was produced by incubating cow's milk with yeast lactase. Sixteen lactose tolerant and 15 intolerant volunteers ingested 500 ml of the product twice daily for 1 month. During the testing period all subjects received on three occasions the same volume of unmodified milk in double-blind tests. Symptoms recorded throughout the study and for an additional 15 day base-line observation period were: diarrhea, abdominal pain and distention, flatulence, heartburn, and headache. Low-lactose milk acceptance was excellent. No significant differences were found between tolerants and intolerants during the base-line period and while ingesting low-lactose milk. By contrast, unmodified milk induced severe symptoms only in the intolerants. Availability of low-lactose milk and of its by-products allows consumption of greater volumes of this highly nutritious food by subjects with lactose intolerance with none or less symptoms compared to unmodified milk.
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PMID:Long-term acceptance of low-lactose milk. 11 42

The role of lactose malabsorption was studied prospectively in 80 schoolchildren with recurrent abdominal pain. Malabsorption was documented in 40 per cent (16 of 59 whites, 12 of 16 blacks and four of five Hispanic children) on the basis of elevated levels of hydrogen in their breath. Those with lactose malabsorption, however, were not clinically distinguishable on the basis of past milk ingestion (P greater than 0.05), weekly pain frequency (median, five vs. six times), presence of diarrhea (40 vs. 27 per cent) or symptom response to lactose load. In children with malabsorption who completed a six-week diet trial, 70 per cent reported increased frequency of pain (P less than 0.002) when placed on their usual lactose-containing diet. Lactose malabsorption has a substantial role in the symptoms of children with recurrent abdominal pain, and it should be considered before performing invasive procedures or assuming a psychogenic origin.
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PMID:Recurrent abdominal pain of childhood due to lactose intolerance. 44 86

Thirty-eight consecutive children with recurrent abdominal pain underwent lactose tolerance tests; 28 of these were also given sucrose tolerance tests. Abdominal pain and abnormal lactose tolerance tests were noted in 11 of 38, while none of the 28 had an abnormal sucrose tolerance test; however, 1 had abdominal pain. Elimination diet for 4 weeks produced significant or total pain relief in 10 of 11 (lactose free) and 0 of 1 children (sucrose free). Lactose intolerance seems to play a contributory role in recurrent abdominal pain in children, while sucrose intolerance does not.
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PMID:Recurrent abdominal pain in children: lactose and sucrose intolerance, a prospective study. 45 May 60

It is heartening to note that relatively well nourished black children in the United States, a number of whom are, in all probability, lactose intolerant and most of whom are destined to become lactose intolerant adults, are able to consume nutritionally valuable quantities of milk with meals and, on the whole, do not report suffering from any abdominal pain or discomfort. It is also encouraging that this population of over two hundred primary school children consumed, on the average, 75 per cent of the 1/2 pt. milk served with lunch, reported drinking an average of three glasses of milk daily, and the vast majority reported liking milk and a number of other dairy products which are important nutrient sources in their diets.
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PMID:Milk consumption by black and by white pupils in two primary schools. 57 29

Lactose-intolerant children manifest diminished or nonexistent intestinal lactase activity, resulting in flatulence, abdominal pain, and diarrhea. To assess the hydrolytic capability of lactase-containing tablets taken immediately before oral lactose challenge, we studied 18 children previously identified as being lactose intolerant and having no underlying organic gastrointestinal disease. Subjects had a mean (+/- SEM) age of 11.4 +/- 3.4 years; 72% were male. At time of the study, lactase-containing tablets or placebo tablets were ingested (double-blind) immediately before drinking a solution of lactose. Breath samples were obtained for hydrogen analysis at 30-minute intervals during a 2-hour period, and clinical symptoms were monitored. In lactose-intolerant patients, hydrogen production was significantly greater following placebo (maximum hydrogen excretion, approximately 60 ppm) compared with lactase-containing tablets (maximum hydrogen excretion, 7 ppm). Increased hydrogen production was associated with clinical symptoms including abdominal pain (89% of subjects following placebo ingestion), bloating (83%), diarrhea (61%), and flatulence (44%). These results indicate, therefore, that coingestion of lactose and lactase-containing tablets significantly reduces both breath hydrogen excretion and clinical symptoms associated with lactose intolerance.
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PMID:Beta-galactosidase tablets in the treatment of lactose intolerance in pediatrics. 212 19

The Authors examined 515 children with abdominal pain in the outpatient clinics for a period of two years. The pain was frequently periumbilical or mid epigastric with a history of more than two months. Persistent lactose malabsorption was found in 252 children (48,9%), which justifies the use of Breath Hydrogen Test as a first diagnostic procedure for assessing recurrent abdominal pain. Putative pathogens were identified in the stool specimens of 21 patients. Oesophagitis was diagnosed in 18 children and duodenal ulcer in one. 91 patients (less than 6 years old) improved after successful treatment of the chronic upper respiratory inflammations. The authors did not find any causes in 18.1 per cent of the children examined and they think that the abdominal pain in these children may be psychogenic. The use of high-fiber diet is proposed for the later group.
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PMID:[Chronic recurrent abdominal pain and lactose malabsorption in childhood]. 226 51

To define the practical diagnostic value of H2 breath testing after lactose load in children with chronic abdominal pain, we measured end-expiratory H2 every 30 minutes for 2 hours after peroral lactose (2 g/kg body weight, Lactoscreen). H2 testing was done in 62 children (28 female, 32 male), aged between 2 and 16 years. Abdominal pain had been observed in these children for more than 2 months. Causes of abdominal pain other than lactose intolerance had been excluded. In 2 out of 62 children, H2 testing was impossible for lack of cooperation. 17 out of the remaining 60 children showed a positive test result (28.3%). In 15 patients, the rise in H2 exceeded 40 ppm, and was thus easily distinguished from a nonspecific rise (less than 25 ppm). Stool pH and Clini-test results were not correlating well with H2 findings, In 16 out of 17 children with positive H2 tests, abdominal pain had ceased on a diet free of lactose after a month. After 6 months 15 out of 17 children were symptom free. These data confirm early indication of non-invasive H2 testing in children with chronic abdominal pain.
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PMID:[Hydrogen (H2) breath test following lactose loading in children with recurrent abdominal pain]. 226 7

The relationship between abdominal pain and bowel gas from bacterial fermentation of undigested carbohydrate was investigated in nine patients with irritable bowel syndrome (IBS), six lactose malabsorbers, and 11 asymptomatic controls. All subjects took breath samples and marked analog scales for abdominal pain, bloating, and psychological stress hourly during all waking hours for 7 days. Breath samples were analyzed for hydrogen concentration within 3 days, and the concentration was corrected for storage time. Symptoms of pain and bloating were significantly more common in IBS patients than in lactose malabsorbers or normal controls, and pain was significantly correlated with bloating in IBS patients. Breath hydrogen concentration was similar in all three groups, and breath hydrogen was not correlated with pain ratings in IBS patients. Thus, abdominal pain may be related to bloating from gastrointestinal gas, but bacterial fermentation cannot be the cause of such gas. The most likely source is swallowed air. This study also demonstrates the feasibility of monitoring hydrogen production in the bowel in field studies by having subjects collect hourly breath samples.
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PMID:Intestinal gas production from bacterial fermentation of undigested carbohydrate in irritable bowel syndrome. 292 57

A 13CO2 breath test using naturally enriched 13C-lactose as a substrate was performed in 47 patients with chronic abdominal pain or chronic diarrhea, taken from a population with a low prevalence of primary acquired lactase deficiency. The cumulative 13CO2 excretion 4 hours after 13C-lactose intake was compared with the H2 breath excretion and with jejunal lactase activity. A physiologically significant relation was found between the cumulative 13CO2 excretion (at 4 hours) and lactase activity, 14.5% 13CO2 excretion being the best cutoff point for discrimination between patients with low and normal lactase activity. The 13CO2 breath test was found to be more sensitive (0.84 versus 0.68) and more specific (0.96 versus 0.89) than the H2 breath test in detecting low jejunal lactase activity. Concordant results of both breath tests performed simultaneously give a reliable picture of the lactose absorption status of the patient. Discordance in results of 13CO2 and H2 lactose breath tests, if not explained by history, indicates in which patients a jejunal biopsy should be performed. If lactase activity and morphology of the biopsy are normal, other causes of discordance must be investigated.
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PMID:13CO2 breath test using naturally 13C-enriched lactose for detection of lactase deficiency in patients with gastrointestinal symptoms. 313 64

The malabsorption of a physiological dose of lactose (0.5 g/kg body weight) was studied in 726 healthy Chinese children, ranging in age from 3 to 18 years, using the breath hydrogen test. The prevalence of lactose malabsorption was found to increase with age; it occurred in less than 15% of preschool-age children and in approximately 45% of younger school-age and 60% of older school-age children. Approximately 70% of adolescents measured showed malabsorption. The critical period of change was from 6 to 7 years of age, with the lactose malabsorption rate rising abruptly from 12 to 43%. The incidence of lactose intolerance in teenagers and adolescents was 27 and 33%, respectively. The great majority of them had only dull abdominal pain. No case of lactose intolerance was seen in children less than 9 years of age. These results indicated that preschool Chinese children can absorb a physiological dose of lactose (equivalent to the average amount of milk consumed daily) without any adverse effects. In contrast, one half of school-age children and two thirds of adolescents were malabsorbers.
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PMID:Developmental changes of lactose malabsorption in normal Chinese children: a study using breath hydrogen test with a physiological dose of lactose. 319 71


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