That is silly, because I’m pretty sure Pegasus is canonically male.

That’s not a unicorn. It’s a whatever Pegasus is.

The Party told you to reject the evidence of your eyes and ears.

Then you need to make your food more calorie dense. The only way to gain weight is to consume more than you use. There is no other way.

Gaining weight requires consuming more calories than you use . If you hate everything you cook you will not eat enough. Simple as.