Well, If I want to induce low blood sugar levels, I eat nothing for maybe four or five hours, and just as I'm wanting something to eat, I have a nice glass of orange juice. I then go for a run.
About 5 minutes later, my vision starts going. If I shut my eyes I can see two bright patches that resemble each side of my brain. I go dizzy. My energy levels drop out the basement. I sweat up like a pig and feel so hungry I could eat dead things on the ground.
Running is impossible due to balance issues. Its walk home and start eating. A while later another diet has been shelved.
When mine are low I just feel like I have wet cheeks and cannot think straight; but I have access to a blood sugar testing kit, so I know that this feeling is low sugars. But not everyone has access to one