Interplanetary fructose

I'm rereading right now Schaub's The Year of No Sugar and it inspired me to write some verses.  What if other races on the comos subsisted on fructose instead of glucose? Here's my Calvin & Hobbes-esque take on it:

So they finally came Set to fulfill their aim Their presence long suspected Narrow-minded for a change In no cultural exchange Were they interested Advanced in technology Pastry cooking and what-not-logy They also loved sweets Tarts and cakes Smoothies and crepes These were their feasts Their biology different (this much was evident) Could only process fructose Scoured for it the universe

Glucose made them fat None of them wanted that Fructose was their stuff of dreams Sugar they knew Was unhealthy to not a few Made them burst their seams Piled their ships with Earth cookies, Soft drinks, candy and licorice All high with high fructose Promised they'd come back No fear of them to attack Peace and sweetness their cause And back they came  No longer tame Their spoils had spoiled Earth's reputation was now soiled

The final couple of verses need some rework, which I'll figure out later. For the actual chemistry check out Schaub's book (Two word summary: avoid fructose!). BTW, the documentary "Fed Up" pairs real well with it.