Iowa Code § 210.19
The standard loaf of bread shall weigh one pound, avoirdupois weight. All bread manufactured, procured, made or kept for the purpose of sale, offered or exposed for sale, or sold in the form of loaves, shall be one of the following standard weights and no other, namely: Three-quarters pound, one pound, one and one-quarter pound, one and one-half pound, or multiples of one pound, avoirdupois weight; and provided further, that the provisions of this section shall not apply to biscuits, buns, crackers, rolls or to what is commonly known as "stale" bread and sold as such, in case the seller shall, at the time of sale, expressly state to the buyer that the bread so sold is "stale" bread. In case of twin or multiple loaves, the weight specified in this section shall apply to the combined weight of the two units.
Iowa Code § 210.19
Referred to in §210.21, 210.23, 210.24