The Cochrane Library: nutrition relevant reviews are there if you look for them!
Ebrahim
S
S
Burke
M
M
Moore
T
T
Sandercock
P
P
D016206:Databases, Bibliographic / Q000592:standards*; D019317:Evidence-Based Medicine; D006801:Humans; D007993:Libraries, Medical / Q000458:organization & administration* / Q000592:standards*; D009747:Nutritional Physiological Phenomena; D012196:Review Literature as Topic