As a kid in East Africa, moved in & out of 'malaria' zones - didn't always take the tablets (paludrin???), but survived OK
In mid '70's did a year in East Kalimantan - took the tablets (daraprim???) religiously but had two goes of Malaria
Recently have done 3 years in Sudan - started on combined daily & weekly stuff, but my UK Doc (with an interest in Travel/Tropical Medicine - did a year as Team Doc for Ford Rally Team etc) persuaded me to take Larium - on the basis that Larium may send you crazy, BUT Malaria kills you!!! - so far no problems;
BUT I think I now have the answer - MARMITE, according to recent reserach, those who eat MARMITE give off an 'odour' that deters MOSSIES
In East Africa, I ate Marmite every day and again in Sudan - but in East Kalimantan the only 'yeast extract' available was that inferior product from the penal settlements - VEGEMITE
MARMITE - LOVE IT OR HATE IT
PZULBA - Out of Africa