I would not feed anything with maggots in it. While ‘technically’ it won’t make them ill; when you spend money on a product, you expect to get exactly what you pay for (without the extra protein
) , and expect it to be fresh. The presence of maggots indicates the product you bought has been on the shelf for a VERY long time. I’ll bet it has been sitting so long that there is no nutritional value left in the food. I would not buy food there again.