Thanks for the abstract, Olafur.
Here's another. It says
"High-protein foods promote postprandial thermogenesis
and greater satiety as compared to high-carbohydrate,
low-fat foods;"
but of course that leaves the question open as
to the exact causal link between protein and satiey.
Interesting about vitamin C. Perhaps I will have to
exercise!

J Am Coll Nutr. 2005 Jun;24(3):158-65. Related Articles, Links

Strategies for healthy weight loss: from vitamin C to the glycemic response.

Johnston CS.

Department of Nutrition, Arizona State University East, 7001 E. Williams
Field Rd., Mesa, AZ 85212. .

Abstract America is experiencing a major obesity epidemic. The ramifications
of this epidemic are immense since obesity is associated with chronic
metabolic abnormalities such as insulin resistance, dyslipidemia, and heart
disease. Reduced physical activity and/or increased energy intakes are
important factors in this epidemic. Additionally, a genetic susceptibility
to obesity is associated with gene polymorphisms affecting biochemical
pathways that regulate fat oxidation, energy expenditure, or energy intake.
However, these pathways are also impacted by specific foods and nutrients.
Vitamin C status is inversely related to body mass. Individuals with
adequate vitamin C status oxidize 30% more fat during a moderate exercise
bout than individuals with low vitamin C status; thus, vitamin C depleted
individuals may be more resistant to fat mass loss. Food choices can impact
post-meal satiety and hunger. High-protein foods promote postprandial
thermogenesis and greater satiety as compared to high-carbohydrate, low-fat
foods; thus, diet regimens high in protein foods may improve diet compliance
and diet effectiveness. Vinegar and peanut ingestion can reduce the glycemic
effect of a meal, a phenomenon that has been related to satiety and reduced
food consumption. Thus, the effectiveness of regular exercise and a prudent
diet for weight loss may be enhanced by attention to specific diet details.

PMID: 15930480

I suspect that the protein is also correcting sub-clinical
deficiencies in various amino-acids (essential and
non-essential).

That might definately be the case sometimes but I don't see how
that would effect weight loss.

If appetite is partly driven to correct dietary deficiencies
-- which I think it is widely aknowledged to be the case
(e.g. pregnant women) -- then correcting amino acid
deficiencies (along with vitamins and minerals)
may supress appetite, independently of any associated
low GI factors.

Cheers,
Michael C Price
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http://mcp.longevity-report.com
http://www.hedweb.com/manworld.htm