scholarly journals Casein and whey exert different effects on plasma amino acid profiles, gastrointestinal hormone secretion and appetite

2003 ◽  
Vol 89 (2) ◽  
pp. 239-248 ◽  
Author(s):  
W. L. Hall ◽  
D. J. Millward ◽  
S. J. Long ◽  
L. M. Morgan
Keyword(s):  
Amino Acid ◽  
Hormone Secretion ◽  
Area Under The Curve ◽  
Plasma Amino Acid ◽  
Gastrointestinal Hormone ◽  
Satiety Response ◽  
Plasma Cholecystokinin ◽  
Amino Acid Profiles ◽  
Hormone Responses ◽  
The Impact

Protein, generally agreed to be the most satiating macronutrient, may differ in its effects on appetite depending on the protein source and variation in digestion and absorption. We investigated the effects of two milk protein types, casein and whey, on food intake and subjective ratings of hunger and fullness, and on postprandial metabolite and gastrointestinal hormone responses. Two studies were undertaken. The first study showed that energy intake from a buffet meal ad libitum was significantly less 90 min after a 1700 kJ liquid preload containing 48 g whey, compared with an equivalent casein preload (P<0·05). In the second study, the same whey preload led to a 28 % increase in postprandial plasma amino acid concentrations over 3 h compared with casein (incremental area under the curve (iAUC), P<0·05). Plasma cholecystokinin (CCK) was increased by 60 % (iAUC, P<0·005), glucagon-like peptide (GLP)-1 by 65 % (iAUC, P<0·05) and glucose-dependent insulinotropic polypeptide by 36 % (iAUC, P<0·01) following the whey preload compared with the casein. Gastric emptying was influenced by protein type as evidenced by differing plasma paracetamol profiles with the two preloads. Greater subjective satiety followed the whey test meal (P<0·05). These results implicate post-absorptive increases in plasma amino acids together with both CCK and GLP-1 as potential mediators of the increased satiety response to whey and emphasise the importance of considering the impact of protein type on the appetite response to a mixed meal.

Fluoxetine-induced changes in body weight and 5-HT1A receptor-mediated hormone secretion in rats on a tryptophan-deficient diet

2004 ◽  
Vol 286 (2) ◽  
pp. R390-R397 ◽  
Author(s):  
D. N. D'Souza ◽  
Y. Zhang ◽  
F. Garcia ◽  
G. Battaglia ◽  
L. D. Van de Kar
Keyword(s):  
Body Weight ◽  
Control Diet ◽  
Hormone Secretion ◽  
Significant Loss ◽  
Tryptophan Depletion ◽  
Deficient Diet ◽  
Hormone Responses ◽  
Plasma Hormones ◽  
Induced Changes ◽  
The Impact

Tryptophan depleting protocols are commonly used to study the role of serotonin in mood disorders. The present study examined the impact of a tryptophan-deficient diet and fluoxetine on the serotonergic regulation of neuroendocrine function and body weight. We hypothesized that the regulation of postsynaptic 5-HT1A receptors is dependent on the levels of 5-HT in the synapse. Rats on a control or a tryptophan-deficient diet received daily injections of saline or fluoxetine (5 or 10 mg·kg-1·day-1 ip) from day 7 to day 21. The tryptophan-deficient diet produced a 41% reduction in the level of 5-HT but no change in the density of [3H]paroxetine-labeled 5-HT transporters. Treatment with fluoxetine inhibited the gain in weight in rats maintained on the control diet. The tryptophan-deficient diet produced a significant loss in body weight that was not significantly altered by treatment with fluoxetine. Treatment with fluoxetine produced a dose-dependent desensitization of hormone responses to injection of the 5-HT1A receptor agonist (±)8-hydroxy-2-(di- n-propylamino)tetralin ((±)8-OH-DPAT). The tryptophan-deficient diet produced an increase in the basal levels of corticosterone but did not alter the basal levels of ACTH or oxytocin. Also, this diet inhibited the magnitude of 8-OH-DPAT-induced increase in plasma levels of ACTH and oxytocin but did not impair the ability of fluoxetine to desensitize the 5-HT1A receptor-mediated increase in plasma hormones. These data suggest that a reserve of 5-HT enables fluoxetine to desensitize postsynaptic 5-HT1A receptors in the hypothalamus. In conclusion, the profound physiological changes induced by tryptophan depletion may complicate the interpretation of studies using this experimental approach.

scholarly journals Lifestyle Modification in Metabolic Syndrome and Associated Changes in Plasma Amino Acid Profiles

2010 ◽  
Vol 74 (11) ◽  
pp. 2434-2440 ◽  
Author(s):  
Mitsumasa Kamaura ◽  
Kiyoko Nishijima ◽  
Mitsuo Takahashi ◽  
Toshihiko Ando ◽  
Shunsaku Mizushima ◽  
...  
Keyword(s):  
Metabolic Syndrome ◽  
Amino Acid ◽  
Lifestyle Modification ◽  
Plasma Amino Acid ◽  
Amino Acid Profiles

PLASMA AMINO ACID PROFILES IN PATIENTS WITH FULMINANT HEPATIC FAILURE

1981 ◽  
Vol 14 (10) ◽  
pp. 1436-1444
Author(s):  
Takaya TANAKA ◽  
Katsuko HARA ◽  
Yasunobu ASAO ◽  
Tohru YASUI ◽  
Masahiko HIKIMA ◽  
...  
Keyword(s):  
Amino Acid ◽  
Fulminant Hepatic Failure ◽  
Hepatic Failure ◽  
Plasma Amino Acid ◽  
Amino Acid Profiles

scholarly journals Early growth and postprandial appetite regulatory hormone responses

2013 ◽  
Vol 110 (9) ◽  
pp. 1591-1600 ◽  
Author(s):  
Mia-Maria Perälä ◽  
Eero Kajantie ◽  
Liisa M. Valsta ◽  
Jens J. Holst ◽  
Jaana Leiviskä ◽  
...  
Keyword(s):  
Test Meal ◽  
Metabolic Diseases ◽  
Hormone Secretion ◽  
Later Life ◽  
Early Growth ◽  
Birth Cohort Study ◽  
Slow Increase ◽  
Increased Risk ◽  
Hormone Responses ◽  
The Impact

Strong epidemiological evidence suggests that slow prenatal or postnatal growth is associated with an increased risk of CVD and other metabolic diseases. However, little is known whether early growth affects postprandial metabolism and, especially, the appetite regulatory hormone system. Therefore, we investigated the impact of early growth on postprandial appetite regulatory hormone responses to two high-protein and two high-fat content meals. Healthy, 65–75-year-old volunteers from the Helsinki Birth Cohort Study were recruited; twelve with a slow increase in BMI during the first year of life (SGI group) and twelve controls. Subjects ate a test meal (whey meal, casein meal, SFA meal and PUFA meal) once in a random order. Plasma glucose, insulin, TAG, NEFA, ghrelin, peptide tyrosine-tyrosine (PYY), glucose-dependent insulinotropic peptide, glucagon-like peptide-1 and a satiety profile were measured in the fasting state and for 4 h after each test meal. Compared with the controls, the SGI group had about 1·5-fold higher insulin responses after the whey meal (P= 0·037), casein meal (P= 0·023) and PUFA meal (P= 0·002). TAG responses were 34–69 % higher for the SGI group, but only the PUFA-meal responses differed significantly between the groups. The PYY response of the SGI group was 44 % higher after the whey meal (P= 0·046) and 115 % higher after the casein meal (P= 0·025) compared with the controls. No other statistically significant differences were seen between the groups. In conclusion, early growth may have a role in programming appetite regulatory hormone secretion in later life. Slow early growth is also associated with higher postprandial insulin and TAG responses but not with incretin levels.

scholarly journals Bolus ingestion of individual branched-chain amino acids alters plasma amino acid profiles in young healthy men

SpringerPlus ◽  
2014 ◽  
Vol 3 (1) ◽  
pp. 35 ◽  
Author(s):  
Takuya Matsumoto ◽  
Koichi Nakamura ◽  
Hideki Matsumoto ◽  
Ryosei Sakai ◽  
Tomomi Kuwahara ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Branched Chain Amino Acids ◽  
Plasma Amino Acid ◽  
Healthy Men ◽  
Amino Acid Profiles ◽  
Branched Chain

Plasma amino acid profiles in preterm infants receiving vamin 9 glucose or vamin infant

1993 ◽  
Vol 32 (1) ◽  
pp. 71-78 ◽  
Author(s):  
Sally G. Mitton ◽  
David Burston ◽  
Martin J. Brueton ◽  
Ilya Z. Kovar
Keyword(s):  
Amino Acid ◽  
Preterm Infants ◽  
Plasma Amino Acid ◽  
Amino Acid Profiles
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