stomach loads? Does it refer to "the amount that fills a stomach"?

Yes, more or less. If the stomach is "loaded" with glucose, or filled, or charged, we could refer to a "stomach load". A full stomach, or nearly full.

Thanks.
"stomach loads of glucose" gives me the impression that you've eaten too much sugar and that is impossible and would kill you. So I've got it grammatically, yet still been confused by the logic.

I don't think the author was suggesting only glucose was eaten. Probably impossible, anyway.
He means foods containing a significant amount of sugars were involved.

Reasonable.

Have you ever eaten a large, stomach filling serving of noodles?

There's a lot of glucose in that serving.

Not only reasonable, but absolutely correct.

This afternoon,we took delivery of two lorry loads of topsoil.