Bettas are pigs. They are very smart and will beg for food. They can live weeks without it but they can also die from over eating.
Basically I recommend 3-6 pellets/blood worms a day for pets. Breeding stock and growing bettas require much more.
Also temperature can affect metabolism. The higher the temperature the faster their body digests food. But generally, for the average betta keeper my recommendation is fine.
Who am I? Well I am a Junior Member of the International Betta Congress and a breeder of white HMPKs, red dragon HMPKs, black/red dragon HMPKs, metallic multi HMPKs, blue masked HMPKs, and now multi color HMs. Soon to add black HMs. I will be showing in New Breeder class in fall of 2012.