model does stress the importance of On Measuring Incidence of Undernutrition intra variation but says nothing about body-weight (or the "inter-action beWhat Is a Consumer Unit? tween genotype and environment'', which Sukhatme has brought into the N Krishnaji discussion for the first time in his pre I AM grateful to P V Sukhatme for his reply (EFW, June 6) to my comments (EPW, May 30) on his procedure for estimating the incidence of undernutrition from a given distribution of intakes. In my note I raised two different issues: one relating to the cutoff point and the other to the procedure for conversion of persons or households into standard consumer units.