THE CHROMOSOME | Clinical Content Series

Case Studies

Browse the full collection of case studies below. Each case study opens on its own page with the complete narrative and detailed FAQs in a clean, readable format.

Disorder 01
Clinical Series

Insulin Resistance

Primary Cause of Obesity | Dr. Zaar

She came in carrying 34 extra kilograms and a decade of being told she lacked discipline. She had done everything right, or rather, everything she had been told was right. She had counted calories. She had walked...

Disorder 02
Clinical Series

Leptin Resistance

Primary Cause of Obesity | Dr. Zaar

He was 44 years old, weighed 127 kilograms, and had not felt full after a meal in years. Not once. He described it as a hole that could never be filled, not hunger exactly, but an absence of satisfaction that...

Disorder 03
Clinical Series

Hypothyroidism

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 38 years old and had gained 28 kilograms over four years without changing anything about the way she ate or lived. She was exhausted in a way she could not explain, not tired from activity but heavy in a...

Disorder 04
Clinical Series

Hashimoto's Thyroiditis

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 32 years old and had been diagnosed with hypothyroidism two years before she came to see me. She was on thyroid medication. Her TSH, her previous physician had told her, was normal. And yet she had continued...

Disorder 05
Clinical Series

Polycystic Ovarian Syndrome

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 26 years old and had been told she had PCOS since she was 19. In those seven years she had seen four gynaecologists, been prescribed the contraceptive pill twice, and had been told to lose weight each time...

Disorder 06
Clinical Series

Cushing's Syndrome

Primary Cause of Obesity | Dr. Zaar

He was 41 years old and had gained 31 kilograms in less than three years. Not gradually, the way most weight accumulates, but rapidly, almost visibly, in a pattern that confused everyone who knew him. The weight had...

Disorder 07
Clinical Series

Hypogonadism

Primary and Secondary Cause of Obesity | Dr. Zaar

He was 38 years old and had not felt like himself in four years. That was how he described it, not like himself. He had gained 26 kilograms without any meaningful change in his diet or activity. His energy was gone....

Disorder 08
Clinical Series

Hyperprolactinaemia

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 29 years old and had not had a regular menstrual cycle in three years. She had gained 22 kilograms in that same period. She was not pregnant, she had been checked repeatedly. She was not breastfeeding. She...

Disorder 09
Clinical Series

Growth Hormone Deficiency

Primary and Secondary Cause of Obesity | Dr. Zaar

He was 47 years old and described his body as having simply given up. That was his exact phrase, given up. He had been athletic in his thirties. He had maintained a reasonable weight without particular effort for...

Disorder 10
Clinical Series

Adrenal Fatigue

Secondary Cause of Obesity | Dr. Zaar

She was 43 years old and had been exhausted for so long she had forgotten what it felt like not to be. Not tired in the ordinary sense, not the tiredness that sleep fixes, but a bone deep depletion that followed her...

Disorder 11
Clinical Series

Cortisol Dysregulation

Primary and Secondary Cause of Obesity | Dr. Zaar

He was 45 years old and could not understand why he was gaining weight from the middle outward while the rest of his body remained relatively unchanged. His arms were thin. His legs had lost their muscle. But his...

Disorder 12
Clinical Series

Metabolic Syndrome

Primary and Secondary Cause of Obesity | Dr. Zaar

He was 52 years old and had been collecting diagnoses for a decade. High blood pressure, diagnosed at 43. High triglycerides, discovered at 46. Prediabetes, identified at 49. Abdominal obesity that his physician had...

Disorder 13
Clinical Series

Non Alcoholic Fatty Liver Disease

Secondary Cause of Obesity | Dr. Zaar

He was 48 years old and had been told at a routine health check that his liver enzymes were mildly elevated. His physician had asked him whether he drank alcohol. He did not, not a drop, ever, in his life. His...

Disorder 14
Clinical Series

Type 2 Diabetes

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 46 years old and had been diabetic for six years. She was on three medications. Her HbA1c, the three month blood sugar average that Pakistani physicians use as the primary measure of diabetic control, had...

Disorder 15
Clinical Series

Prediabetes

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 39 years old and had been told at a routine blood test that her fasting glucose was slightly elevated, 108 milligrams per decilitre. Her physician had told her this was borderline, that she should watch her...

Disorder 16
Clinical Series

Hyperinsulinaemia

Primary Cause of Obesity | Dr. Zaar

She was 34 years old and had never been told what was wrong with her. That was precisely how she described it, nobody had ever told her what was actually wrong. She had been overweight since her early twenties. She...

Disorder 17
Clinical Series

Oestrogen Dominance

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 37 years old and described her body as having changed completely over the previous four years in ways she could neither explain nor control. The weight had arrived differently to anything she had experienced...

Disorder 18
Clinical Series

Low Testosterone

Primary and Secondary Cause of Obesity | Dr. Zaar

He was 44 years old and had spent three years being told he was fine. His annual blood tests had returned within normal limits each time. His blood pressure was acceptable. His fasting glucose was normal. His...

Disorder 19
Clinical Series

Perimenopausal Hormonal Shift

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 46 years old and described the previous two years as the most physically confusing of her life. Her periods had become unpredictable, sometimes arriving early, sometimes late, sometimes heavy beyond anything...

Disorder 20
Clinical Series

Menopausal Hormonal Shift

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 53 years old and had not had a period in fourteen months. By clinical definition she was postmenopausal. By her own description she was unrecognisable, not in the dramatic sense of acute illness but in the...

Disorder 21
Clinical Series

Andropause

Primary and Secondary Cause of Obesity | Dr. Zaar

He was 51 years old and had come to see me at his wife's insistence. That detail matters, because in Pakistan, a man of his generation does not present to a physician for fatigue, weight gain, or low mood. He...

Disorder 22
Clinical Series

Thyroid Nodules

Secondary Cause of Obesity | Dr. Zaar

She was 44 years old and had discovered the lump herself, a small, firm swelling on the right side of her neck that she had noticed while applying moisturiser one morning. She had felt it for weeks before mentioning...

Disorder 23
Clinical Series

Subclinical Hypothyroidism

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 41 years old and had been told repeatedly, across four years of annual blood tests, that her thyroid was fine. Her TSH had been sitting between 3.8 and 4.6 milliunits per litre across those four years, within...

Disorder 24
Clinical Series

Hyperthyroidism

Secondary Cause of Obesity | Dr. Zaar

She was 38 years old and had lost 11 kilograms in four months without trying. In Pakistan, where weight loss is the aspiration of a significant proportion of the population, this might seem like something to...

Disorder 25
Clinical Series

Parathyroid Disorders

Secondary Cause of Obesity | Dr. Zaar

He was 49 years old and had been referred to me by a nephrologist, which is an unusual referral pathway for an obesity clinic, but one that made complete clinical sense once I understood his history. He had developed...

Disorder 26
Clinical Series

Vitamin D Deficiency

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 36 years old and had been tired for so long that she had accepted tiredness as her baseline state. Not the tiredness of a busy day or a poor night, but a pervasive, whole body exhaustion that was present...

Disorder 27
Clinical Series

Sex Hormone Binding Globulin Disorders

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 33 years old and had been told her hormones were normal. She had been told this by two gynaecologists and one endocrinologist across three years of increasingly frustrating clinical encounters in which she...

Disorder 28
Clinical Series

DHEA Imbalance

Primary and Secondary Cause of Obesity | Dr. Zaar

He was 47 years old and described himself as having aged a decade in three years. Not in the way people say this casually, as a figure of speech for feeling tired or overworked, but in the precise, biological sense...

Disorder 29
Clinical Series

Melatonin Disruption

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 39 years old and had not slept properly in four years. Not dramatically, not in the way of someone who lies awake all night or cannot sleep at all, but in the more insidious way of a person who spends eight...

Disorder 30
Clinical Series

Ghrelin Dysregulation

Primary and Secondary Cause of Obesity | Dr. Zaar

He was 42 years old and was genuinely confused about his own hunger. Not in a philosophical sense, in a precise, clinical sense that he articulated with unusual self awareness when he sat across from me. He was...

Disorder 31
Clinical Series

Adiponectin Deficiency

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 44 years old and had what her previous physicians described as unusually aggressive metabolic syndrome for her degree of obesity. She was carrying 26 extra kilograms, significant, but not extraordinary by the...

Disorder 32
Clinical Series

IGF-1 Imbalance

Primary and Secondary Cause of Obesity | Dr. Zaar

He was 46 years old and had been an athlete in his twenties. Not professionally, but in the way that many Pakistani men of his generation had been physically active, strong, and metabolically resilient without...

Disorder 33
Clinical Series

Hirsutism Related Hormonal Disorders

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 31 years old and had been removing facial hair since she was seventeen. Not occasionally, daily. Every morning before leaving her house she spent twenty to thirty minutes managing the hair growth along her...

Disorder 34
Clinical Series

Gestational Diabetes History

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 38 years old and had been told, at the six week postnatal check following her third delivery four years earlier, that her blood sugar had returned to normal and that the gestational diabetes she had developed...

Disorder 35
Clinical Series

Post Pregnancy Hormonal Weight Retention

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 34 years old and had not returned to her pre-pregnancy weight after her second delivery eighteen months earlier. This was not, in itself, unusual, post-partum weight retention is common and its resolution...

Disorder 36
Clinical Series

Thyroid Antibody Positivity

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 35 years old and had been told her thyroid was normal. She had been told this three times across four years, each time she had presented with the constellation of symptoms that had been accumulating since her...

Disorder 37
Clinical Series

Pituitary Microadenomas

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 33 years old and had been gaining weight for three years without being able to explain why, not to herself and not to the four physicians she had consulted in that time. She was eating the same food she had...

Disorder 38
Clinical Series

Hypothalamic Obesity

Primary Cause of Obesity | Dr. Zaar

He was 29 years old and had gained 41 kilograms in three years. Not gradually, rapidly, relentlessly, in a pattern that bore no relationship to his eating habits, his activity level, or any behavioural factor that he...

Disorder 39
Clinical Series

Reactive Hypoglycaemia

Primary and Secondary Cause of Obesity | Dr. Zaar

She was 37 years old and had organised her entire life around her hunger. Not consciously, not in the deliberate way of someone who plans their meals with nutritional intention, but in the reactive, urgent way of a...

Disorder 40
Clinical Series

Fatty Liver Hormonal Axis Disruption

Primary and Secondary Cause of Obesity | Dr. Zaar

He was 52 years old and had been managing his health through the lens of individual diagnoses for a decade. Fatty liver, identified on ultrasound at 42 and noted in his file without further action. High...