Study	Reason for exclusion
Heilbronn 2002	Participants were of unknown diabetic status at the start of the intervention (diabetic or improved diabetic), although all had previously been diagnosed as having type 2 diabetes in the last ten years
Jarvi 1999	Duration of intervention less than 4 weeks (24 days)
Jenkins 1988	Duration of intervention less than 4 weeks (2 weeks)
Lafrance 1998	Duration of intervention less than 4 weeks (12 days)
Ma 2008	Co‐intervention of alteration of the medications when diagnosed as necessary according to %HbA1c levels
Wolever 1992 b	Duration of intervention less than 4 weeks (2 weeks)
Wolever 2008	Participants commenced the study with already optimised HbA1c levels (6.2 ± 1% HbA1c) and hence this study was excluded, since the effect of diet on HbA1c was our primary outcome