RE: Protein Isolates, Hunger & Food Intake

[Guest guest]

>>>(3) do you feel soya consumption (isolate or food) and Whey Isolate

Protein, in moderation, is safe for human health (some argue it is not).

I was just asked this question, which I responded to, and there have

also been discussion here on the different protein isolates and their

use.

In regard to the topic, this study just came out in the Journal Of

Nutrition and thought some of you might find it interesting.

I have not seen the full study yet.

Regards

jeff

The American Society for Nutritional Sciences J. Nutr. 134:3011-3015,

November 2004

Protein Source, Quantity, and Time of Consumption Determine the

Effect of Proteins on Short-Term Food Intake in Young Men1,2

G. Harvey 3, Sandy N. Tecimer, Deepa Shah and Tasleem A. Zafar

Department of Nutritional Sciences, Faculty of Medicine, University of

Toronto, Toronto, ON, Canada M5S 3E2

3To whom correspondence should be addressed. E-mail:

harvey.anderson@... <mailto:harvey.anderson@...>.

The objective of these 4 studies was to describe the effects of protein

source, time of consumption, quantity, and composition of protein

preloads on food intake in young men. Young men were fed isolates of

whey, soy protein, or egg albumen in sweet and flavored beverages (400

mL) and provided a pizza meal 1-2 h later. Compared with the water

control, preloads (45-50 g) of whey and soy protein, but not egg

albumen, suppressed food intake at a pizza meal consumed 1 h later. Meal

energy intake after egg albumen and soy, but not after control or whey

treatments, was greater when the treatments were given in the late

morning (1100 h) compared with earlier (0830-0910 h). Suppression of

food intake after whey protein, consumed as either the intact protein or

as peptides, extended to 2 h. Altering the composition of the soy

preload (50 g) by reducing the soy protein content to 25 g and by adding

25 g of either glucose or amylose led to a loss in suppression of food

intake by the preload. Egg albumen, in contrast to whey and soy

preloads, increased cumulative energy intake (sum of the energy content

of the preload plus that in the test meal) relative to the control. We

conclude that protein source, time of consumption, quantity, and

composition are all factors determining the effect of protein preloads

on short-term food intake in young men.