Hormones Matter

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Hormones Matter

Derrick Lonsdale MD, FACN, CNS

Derrick Lonsdale M.D., is a Fellow of the American College of Nutrition (FACN), Fellow of the American College for Advancement in Medicine (FACAM). Though now retired, Dr. Lonsdale was a practitioner in pediatrics at the Cleveland Clinic for 20 years and was Head of the Section of Biochemical Genetics at the Clinic. In 1982, Lonsdale joined the Preventive Medicine Group to specialize in nutrient-based therapy. Dr. Lonsdale has written over 100 published papers and the conclusions support the idea that healing comes from the body itself rather than from external medical interventions.

Gastrointestinal tract and thiamine

Gastrointestinal Disease and Thiamine

by Derrick Lonsdale MD, FACN, CNS
June 9, 2025
18.4K views

The gastrointestinal (GI) tract, long thought to be specific only to the process of digestion, starts at the mouth and ends at

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serotonin syndrome thiamine

Serotonin Syndrome and Thiamine: Is There a Connection?

by Derrick Lonsdale MD, FACN, CNS
May 7, 2025
34.3K views

Serotonin syndrome is described as a drug-related condition and is commonly believed to be rare. Serotonin is a neurotransmitter, but its actions

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thiamine limbic system

How Can Something As Simple as Thiamine Cause So Many Problems?

by Derrick Lonsdale MD, FACN, CNS
April 29, 2025
165.6K views

I have read a criticism that thiamine deficiency is “too simple” to explain the devastating nature of the post Gardasil illnesses or

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mystery illness

Mystery Illness: You Are Not Alone

by Derrick Lonsdale MD, FACN, CNS
April 21, 2025
13.6K views

Hormones Matter is a health oriented website edited by Chandler Marrs, PhD. She has long recognized the need for people to report

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thiamine dependency

Thiamine Deficiency and Dependency Syndromes: Case Reports

by Derrick Lonsdale MD, FACN, CNS
April 14, 2025
39.6K views

I have been studying thiamine metabolism since 1969 when I published the first case of thiamine dependency: Intermittent cerebellar ataxia associated with hyperpyruvic

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juvenile arthritis thiamine

Juvenile Rheumatoid Arthritis: An Unusual Treatment

by Derrick Lonsdale MD, FACN, CNS
March 31, 2025
20.5K views

Case example 6.13 on page 248 of our book, Thiamine Deficiency Disease, Dysautonomia and High Calorie Malnutrition, is the story of a

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health, healing and illness

The Exquisite Simplicity of Health and Illness: Mitochondria and Energy

by Derrick Lonsdale MD, FACN, CNS
March 11, 2025
18K views

For years I have struggled to get people to understand the relative simplicity of what causes us to get sick. Our medical

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Refeeding syndrome in thiamine deficiency

Refeeding Syndrome in the Context of Thiamine Deficiency

by Derrick Lonsdale MD, FACN, CNS
March 6, 2025
43.1K views

Although this has been mentioned many times in posts and in the comments of readers on this website, there still seems to

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