Weight to lose

The biggest place I can lose weight is off myself.
I can lose the entire weight of the bike and still only be at the low end of "normal".

But apart from that, where could I save a bit off the bike?

Affordable Weight Fanaticism (Again!)

Used, but freshly cleaned, pg850 11-32 cassette.

Hmm. I shaved, and weighed my beard.
Because every gram counts, right?
(3 grams was all it weighed!)

On a more sensible note, I have been thinking about aluminium rear cogs.
If one can buy an affordable chainring in 6061 or 7075, why do there seem to be few (if any) similarly sized rear cogs available.
I'm not taking about the small sizes, like 11s through to 20-ish.
I am talking about the larger rear cogs, like 28 to 36.