It has had no ill effect on him and it will not. Right now, your boa is doing something rare in captivity; " He is making his own choice when he eats, by going off feed when he chooses. " Alot of boas will not do that in captivity because they are so " pre-programmed " by their keepers feeding schedule. I do not have a " feeding schedule. " I feed every 3-5 weeks and sometimes longer. If I was to recommend a " feeding schedule " to anyone, it would be no more than every 21 days for sub - adults and no more than once a month for adults. Babies, are the only exception to this rule. Feed them every 14 days and here is the reason; " In the wild, the biggest majority of a babies food comes from frogs and lizards. Mice are not indigenous to South America and it is HIGHLY unlikely that baby Boas are out there raiding rat nests. The moma rats would make short work of a baby boa.In essence, their are alot of frogs and lizards scurring the ground and they are less intelligent and make the baby boas food source, more attainable.All of this changes as the Boa gets larger and starts leaning more toward mammals for food. AT that point, they become complete ambush hunters. If you take a adult or sub-adult Boa and put it in the middle of your living room with a live rat, the rat " unless retarded " will not go toward the Boa. Same in the wild. If a mammal sees the snake, it does not have a chance at getting a meal. Imagine a boa curled up somewere waiting for a meal to come by. How long do you think it will take for a prey item to scurry within the strike range?; days,weeks or months, who knows? In essence, " Theres no set time or schedule. " You can rest assured for one thing though; " There not lucky all that much. " Hence, the reptile; " Cold blooded with a slow metabolism. " In the wild when they eat, they utilize every little bit of nutrients they can from the prey. In captivity, they are to busy beeing fed to utilize much of anything other than the fat in the prey.Years ago, when I overfed, I had a boa so fat, that it HAD to be fed dead prey in order to eat, because it was to fat to exude the effort in killing. Now, I have adult boas that are " pure muscle " and can jerk a 8 pound rabbit clean off of the cage floor and wrap it so hard and quick that the poor bunny cannot even let out a yelp! Of course, they only get those rabbits rarely. In essence, Yes I starve my boas and they love it.......Johnson Herp