"Obesity Code" Reader - Insulin/Glucagon Question/Confusion

Hi - so I’ve been reading the book and gotten to the part about cortisol and I think I’m missing something. I’ve googled online and I don’t read much written about it, and it’s thoroughly confusing as to why it’s not a topic of conversation.

So, Dr. Fung goes to GREAT length (repetitive length) explaining to us that “insulin causes weight gain,” and that when blood glucose is high, the pancreas releases insulin to help burn (immediately) or store (as fat) that extra energy (sugar) so it doesn’t “corrode the pipes” so to speak.

I get that.

He also explains that he “can make anyone fat” by prescribing them insulin, and that newly diagnosed diabetic patients often complain about weight gain.

I get that too.

But then he gets into cortisol as the opposite of insulin, and how important cortisol regulation is in relation to insulin, etc.

And then I lost him.

Isn’t glucagon the “opposite” of insulin? An, as an extension of that, if I inject insulin into my bloodstream and it causes me to gain weight, if I inject glucagon into my bloodstream, it should do the opposite (tell the liver my blood sugar is low and to release fat stores to power my depleted cells)?

I get he might be roundabout-ly saying that by reducing insulin (whether through diet or cortisol/stress reduction and other means), that goal is achieved naturally, but I see almost nothing about human trials involving what happens to (otherwise healthy) humans with glucagon injections - it’s only used as an “emergency diabetic hypoglycemia” kit when someone’s insulin gets too low and they need a shot to raise it, I’m assuming, by triggering the liver to release sugar into the bloodstream…

Which, again, seems like it would work great for weight loss when fasting…

Am I missing something? Has any one heard about this being tested?