 A short @-@ lived increase in seizure frequency may occur during illness or if ketone levels fluctuate . The diet may be modified if seizure frequency remains high , or the child is losing weight . Loss of seizure @-@ control may come from unexpected sources . Even " sugar @-@ free " food can contain carbohydrates such as <unk> , sorbitol , starch and fructose . The sorbitol content of suntan lotion and other skincare products may be high enough for some to be absorbed through the skin and thus negate ketosis . 
