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Why Can’t My Doctor Find My Thyroid Problem?
Many patients experience fatigue, weight gain, cold intolerance, and brain fog despite being told their thyroid tests are “normal.” This article explains why thyroid disease is frequently missed, how temperature, genetics, inflammation, diet, and hormone conversion affect symptoms, and why a normal TSH does not rule out clinically meaningful hypothyroidism. Understanding thyroid function beyond basic labs often leads to answers patients have been seeking for years.

David Stephen Klein, MD FACA FACPM
2 days ago6 min read


Microplastics and Human Health: What Medicine Is Beginning to Understand.
Microplastics and nanoplastics have emerged as a previously unrecognized but increasingly relevant source of chronic environmental exposure. Once thought to be biologically inert, these particles—derived from degraded consumer plastics and industrial materials—are now routinely detected in human blood, stool, lung tissue, placenta, breast milk, and even atherosclerotic plaques. Their presence in these tissues challenges long-standing assumptions about plastic safety and raise

David S. Klein, MD FACA FACPM
4 days ago5 min read


Uric Acid and Colorectal Cancer: An Emerging Predictive Biomarker
Elevated uric acid is more than a marker for gout. Growing evidence suggests it reflects metabolic inflammation and oxidative stress linked to increased colorectal cancer risk. This physician-led review explores how uric acid functions as a predictive biomarker, its relationship to insulin resistance and chronic inflammation, and how average-risk screening tools like Cologuard fit into a modern preventive care strategy focused on early detection and risk reduction.

David S. Klein, MD FACA FACPM
Jan 255 min read


St. John's Wort: Why This "Natural" Supplement Can Be Medically Dangerous
St. John’s wort is often viewed as a safe, natural supplement, but it is one of the most dangerous herbal products when combined with prescription medications. By strongly inducing liver enzymes and drug transporters, it can lower blood levels of antidepressants, birth control pills, anticoagulants, and transplant medications—sometimes leading to serotonin syndrome, unintended pregnancy, stroke, or organ rejection.

David S. Klein, MD FACA FACPM
Jan 204 min read


Advanced Glycation End Products (AGEs):
Advanced glycation end products (AGEs) are biologically active compounds formed through non-enzymatic reactions between sugars and proteins, lipids, or nucleic acids. While AGE accumulation is a normal feature of aging, modern dietary patterns, insulin resistance, oxidative stress, and chronic hyperglycemia markedly accelerate their formation. Increasing evidence identifies AGEs as a central and under-recognized contributor to atherosclerotic cardiovascular disease (ASCVD) an

David S. Klein, MD FACA FACPM
Jan 164 min read


Influenza A and B Outbreaks: Why the Flu Season Comes in Waves
This year’s influenza season has followed a familiar clinical pattern, with an early surge of Influenza A infections followed by a later rise in Influenza B cases. While Influenza A is often associated with more severe illness and higher early hospitalization rates, Influenza B can extend the flu season and cause significant disease, particularly in children and older adults. Understanding this progression helps explain why flu activity persists later into the season and unde

David S. Klein, MD FACA FACPM
Jan 153 min read


Zepbound® (tirzepatide) and Menopausal Weight Loss: A Promising Ally for a Challenging Transition
Menopause is a time of profound metabolic transition, and for many women, weight gain becomes an unwelcome companion despite disciplined efforts with diet and exercise. As estrogen levels fall, resting metabolism slows, visceral fat accumulates, and insulin sensitivity declines—creating a perfect storm that resists traditional weight-loss approaches. Zepbound® (tirzepatide) offers a meaningful breakthrough for women facing these challenges. By activating both GIP and GLP-1 re

David S. Klein, MD FACA FACPM
Nov 25, 20253 min read


The Link Between Estradiol and Bone Health: Preventing Osteoporosis, Osteopenia, and Dementia
By restoring estradiol through evidence-based bioidentical hormone therapy, guided by physicians experienced in integrative care, you can reduce fracture risk, sustain memory, and enhance life quality.

David S. Klein, MD FACA FACPM
Nov 20, 20255 min read


Hearing Loss and Your Brain. Why Getting Hearing Aids Now Can Help Protect You From Dementia
Untreated hearing loss increases the risk of dementia by straining the brain and promoting social isolation. Early hearing-aid use helps preserve cognition and quality of life.

David S. Klein, MD FACA FACPM
Nov 18, 20257 min read


Understanding the Connection Between Hypothyroidism and Atherosclerotic Heart Disease
Hypothyroidism is far more than a problem of low metabolism—it’s a quiet amplifier of vascular disease. By addressing thyroid imbalance, we not only restore energy and mental clarity but also protect the heart from atherosclerotic injury. Managing these conditions together yields the best outcomes for long-term vitality and longevity.

David S. Klein, MD FACA FACPM
Nov 13, 20255 min read
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