The speaker explains that symptoms like shaking, sweating, nausea, anxiety, irritability, fatigue, rapid heart rate, and dizziness can be mistaken for anxiety or panic attacks but are actually symptoms of hypoglycemia, or low blood sugar. This condition occurs when one goes too long without eating. The speaker emphasizes that if someone already has anxiety, experiencing hypoglycemia can exacerbate their symptoms. To manage anxiety better, the speaker stopped eating poorly and skipping meals, focusing instead on balanced nutrition. They stress the importance of not just consuming carbohydrates, which can cause rapid blood sugar spikes and drops, but ensuring meals include proteins, carbohydrates, and dietary fats. This approach helps maintain stable blood sugar levels and supports brain health.