Well, one would need....common sense.
I gave you the death breakdown, and given that a substantial chunk of deaths comes from developed nations, where protein/calorie malnutrition is rare, plus the fact that in the developing world it’s not very common anymore leads to the obvious conclusion that 40% of the worlds deaths cannot be from malnutrition.
The other basic fact on this might be the fact that literally NO references stating anything like this have ever been produced by anyone.
For Tim’s supposition to be true, you would then need to somehow show biofuels are causing this excess death, and again..no evidence has been produced.
I suppose you could just make stuff up though. That seems to be a big thing with deniers.