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August 05, 2026
About one in nine adults is on a GLP-1 right now. And women with ADHD kept telling me the exact same thing after starting GLP-1 medications: they expected to lose weight, but they did not expect their brains to feel different.
The brain fog lifted. The food noise got quieter. Energy felt steadier. Emotional reactions became easier to interrupt. For some, inflammation, pain, bloating, cravings, and compulsive behaviors changed too.
So I brought back Dr. Kalin Johnson to tell us whether there is real science behind that or whether we are getting ahead of the evidence. Kalin is a licensed clinical pharmacist, functional medicine wellness coach, and patient advocate who runs a concierge whole-person care practice for high-achieving, high-masking neurodivergent adults. She is also queer, ADHD, autistic, and living with hypermobile Ehlers-Danlos Syndrome, and this is her fourth time on the show.
In this episode, Kalin and I get into how GLP-1 receptors communicate across the gut, brain, pancreas, immune system, and vagus nerve, and why that matters for ADHD women. They also talk about food noise, brain fog, inflammation, metabolic health, emotional regulation, microdosing, side effects, muscle loss, access, and what the research still cannot tell us.
“GLP-1 is not just a gut hormone. It is a communication molecule between the gut, pancreas, immune system, and brain.”
- Dr. Kalin Johnson
“A lot of people think the brain is directing the body, but often the body is directing the brain”
- Dr. Kalin Johnson
“When someone has lived with chronic metabolic instability, inflammation, or cognitive load, that baseline can start to feel normal.”
-- Dr. Kalin Johnson
"Chronically elevated stress hormones can increase inflammation, worsen insulin resistance, disrupt sleep, and impair executive function."
-- Dr. Kalin Johnson
"Sometimes the body does not need a shove. It just needs a small signal to get the system back online"
-- Dr. Kalin Johnson
"We attach moral ideas to weight, and that stigma blocks us from understanding what is actually happening in someone’s body. There is this idea that there is a right way to lose weight, and if you cannot do it through pain and suffering, you will be shamed."
- Dr. Kalin Johnson
- Dr. Kalin Johnson shares how physical symptoms, brain fog, and burnout led to her ADHD diagnosis.
- Tracy introduces the unexpected ADHD-related improvements women report on GLP-1 medications.
- Kalin explains GLP-1 as a gut, brain, immune, and metabolic signaling molecule.
[11:51 – 36:42] Brain Fog, Metabolism, and Whole-Body Effects
- Kalin explains how GLP-1 medications affect reward, impulse control, emotional regulation, and the vagus nerve.
- She compares single, dual, and triple agonist medications including semaglutide, tirzepatide, and retatrutide.
- They discuss brain fog, inflammation, metabolic flexibility, energy, hypermobility, POTS, MCAS, and autoimmune symptoms.
[36:42 – 01:01:52] Cravings, Microdosing, Access, and Future Research
- Kalin connects food noise, cravings, compulsive urges, and cognitive bandwidth to reward and metabolic signaling.
- Tracy and Kalin discuss muscle preservation, microdosing, side effects, maintenance dosing, and long-term use.
- The conversation closes with GLP-1 research on chronic disease prevention, healthcare access, and Kalin’s resources.
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- Website: kalinjohnson.com
- Instagram: @kalinpharmd
- LinkedIn: kalin-johnsonpharmd
- Ania Jastreboff, MD - Director of the Yale Obesity Research Center, principal investigator on many of the landmark trials for tirzepatide and retatrutide. If you watch only one thing, watch her Lincoln Center talk: yale.edu/profile/ania-jastreboff
- Dr. Spencer Nadolsky: @drnadolsky
- Rocio Salas-Whalen MD: @drsalaswhalen
