Show me a documented case of someone who cannot eat carbs but can eat protein and fats just fine. There. The burden of proof is on you since you started this whole debacle.
Quite evidently you started this whole 'debacle' because you chose to imply that I was inventing my friend's food allergies (though why I would be apparently motivated to do so I have no idea). Then when I told you what he suffers from, you claim that allergies and syndromes aren't serious and don't exist.
Aside from the fact that a diet of fats and proteins with minimal carbs and
no carbohydrate staples is the traditional diet of the entire Inuit peoples - and thus completely uncontroversial - there is plenty of information regarding how FPIES is also provoked by carbohydrate staples, such as:
Pediatrics. 2003 Apr;111(4 Pt 1):829-35.
Food protein-induced enterocolitis syndrome caused by solid food proteins.
Nowak-Wegrzyn A1, Sampson HA, Wood RA, Sicherer SH.
"Cereals, vegetables, and poultry meats, typically regarded as of low allergenic potential, must be considered in the evaluation of FPIES"
http://www.ncbi.nlm.nih.gov/pubmed/12671120
J Allergy Clin Immunol Pract. 2013 Jul-Aug;1(4):317-22.
Food protein-induced enterocolitis syndrome (FPIES): current management strategies and review of the literature.
Järvinen KM1, Nowak-Węgrzyn A2.
"FPIES is elicited most commonly by milk and soy proteins;
however, rice, oat, and other solid foods may also elicit FPIES"
http://www.jaci-inpractice.org/article/S2213-2198(13)00200-6/abstract
Arch Dis Child 2009;94:220-223
Rice: a common and severe cause of food protein-induced enterocolitis syndrome
Mehr, A; M Kakakios, A; S Kemp
"This study highlights the emerging importance of
rice, a food commonly thought to be “hypoallergenic”, as a significant trigger of FPIES."
http://adc.bmj.com/content/94/3/220.short
Clinical Nutrition. June 2006. Volume 25, Issue 3, Pages 533–536
Rice protein-induced enterocolitis syndrome
Iva Hojsak, Mirjana Kljaić-Turkalj, Zrinjka Mišak, Sanja Kolaček
"This report shows that even hypoallergenic foods such as rice may cause FPIES"
http://www.clinicalnutritionjournal.com/article/S0261-5614(05)00231-1/abstract
Rev Med Liege. 2014 Jul-Aug;69(7-8):412-4.
Food protein-induced enterocolitis syndrome caused by fish ingestion. A case report.
"Cow's milk and soy protein are most often responsible, but
FPIES may be caused by solid foods such as egg white, wheat, rice, nuts, chicken and fish."
http://www.ncbi.nlm.nih.gov/pubmed/25158381
Current Opinion in Allergy & Clinical Immunology. August 2009 - Volume 9 - Issue 4 - p 371–377
Food protein-induced enterocolitis syndrome
Nowak-Węgrzyn, Annaa; Muraro, Antonellab
"Rice is the most common solid food causing FPIES. Rice FPIES is associated with more severe reactions than other foods.
Cow's milk and soy are the most common causes of FPIES, but cereal grains (rice, oat, and barley), fish, poultry, and vegetables may also cause FPIES."
http://journals.lww.com/co-allergy/...rotein_induced_enterocolitis_syndrome.16.aspx
So now, I invite you to substantiate your claim that allergies are not serious and syndromes do not exist; I'm waiting with baited breathe to read your evidence.