The largest prospectivestudy of 34 192 Seventh Day Adventists suggested cancerof the colon (relative risk (RR)51?88, 95 % CI 1?24, 2?87;P 5 0?003) and prostate (RR 5 1?54, 95 % CI 1?05, 2?26;P 5 0?03) were significantly more likely in omnivoresthan in vegetarians(27)although this was not confirmed ina recent pooled analysis from two UK populations(30).