Dr. Ashley LucasPhD Nutritionist & Dietitian | Owner & Founder PHD Weight Loss & Dr. Ashley Wellness

Fix Morning Brain Fog in 5 Seconds

9 Jan 2026 · 0 min

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Short advice from Dr. Ashley Lucas explaining that overnight natural dehydration can slow metabolic activity and raise cortisol, which may increase morning hunger. The speaker recommends starting the day with a large glass of lukewarm or warm water to improve cellular energy, digestion, and mental clarity.

Overnight, your body experiences natural dehydration that totally slows metabolic activity. Mild dehydration raises cortisol, which can elevate morning hunger signals. So you'll be more hungry in the morning. If you start your day dehydrated. A big glass of water first thing in the morning helps to improve cellular energy, digestion, and mental clarity. If you can make that water kind of lukewarm to warm, it's going to be much more healing on the body and really beneficial for your digestive system.