Weight Loss with Adrenoleukodystrophy (ALD/AMN) in South Africa

A peroxisomal disorder where very-long-chain fatty acid accumulation destroys the adrenal glands and myelin — creating a weight management picture dominated by adrenal insufficiency, neurological decline, and cortisol dependence

X-linked Adrenoleukodystrophy (X-ALD) is a rare peroxisomal disorder caused by mutations in the ABCD1 gene, which encodes the ALD protein — a transporter that moves very-long-chain fatty acids (VLCFAs, carbon chains longer than C22) into peroxisomes for beta-oxidation. When this transporter is deficient, VLCFAs accumulate in plasma and tissues, with particularly damaging effects in the adrenal cortex, the myelin sheaths of the central nervous system, and the spinal cord.

X-ALD is X-linked, meaning it primarily affects males. Females who are carriers may develop milder symptoms, particularly the spinal cord form. The condition has several distinct clinical presentations:

Childhood cerebral ALD (CCALD): Rapidly progressive inflammatory demyelination in boys aged 5-12, leading to severe disability and death within 2-5 years if untreated.
Adrenomyeloneuropathy (AMN): The adult phenotype. Progressive spinal cord and peripheral nerve demyelination in men aged 20-50, causing spastic paraparesis, bladder dysfunction, and sensory loss. The majority of adult males with ABCD1 mutations develop AMN.
Addison disease only: Some males present only with primary adrenal insufficiency (Addison disease) without initial neurological symptoms, though many later develop AMN.
Female carriers: About 80% develop AMN-like spinal cord symptoms by age 60 (though adrenal involvement is rare in females).

This article focuses on weight management in adult males with AMN or ALD-related Addison disease — the group where diet and lifestyle questions are most relevant.

Critical safety warning: If you have ALD/AMN with adrenal insufficiency, you are on daily cortisol replacement (hydrocortisone or equivalent). NEVER attempt significant calorie restriction, prolonged fasting, or extreme exercise programmes without specialist guidance. Adrenal crisis — a life-threatening drop in cortisol — can be triggered by illness, physiological stress, or inadequate cortisol dosing during exercise. Always carry an emergency cortisol injection kit and wear medical ID. Consult your endocrinologist before making any dietary changes.

Adrenal Insufficiency — The Dominant Weight Management Factor

VLCFA accumulation destroys the adrenal cortex in the majority of males with X-ALD, causing primary adrenal insufficiency (Addison disease). Without cortisol and, in some cases, aldosterone, the body cannot regulate blood sugar, blood pressure, sodium balance, or the stress response. The hallmarks are profound fatigue, weight loss, hypotension, salt craving, hyperpigmentation (bronze skin), nausea, and hypoglycaemia.

Adrenal insufficiency is treated with lifelong hydrocortisone replacement (typically 15-25 mg daily in divided doses, mimicking the natural diurnal cortisol rhythm) and often fludrocortisone (a mineralocorticoid to retain sodium and maintain blood pressure). Once cortisol replacement is optimised, most patients stabilise — but the balance is delicate.

How Cortisol Replacement Affects Body Weight

Hydrocortisone at physiological replacement doses does not inherently cause weight gain when dosed correctly. However, over-replacement — taking too much cortisol — promotes visceral fat accumulation, insulin resistance, muscle wasting, and a Cushing-like appearance. Under-replacement causes fatigue, loss of appetite, and weight loss. Getting the dose right, in consultation with your endocrinologist, is the single most important step for stable weight management.

Timing of cortisol doses matters for energy and activity:

The first dose (typically the largest, 10 mg) should be taken immediately upon waking, before getting out of bed, to replicate the normal cortisol morning surge.
A second dose (5-10 mg) at midday, and optionally a small third dose (2.5-5 mg) in the early afternoon, mimics the natural decline.
Taking hydrocortisone too late in the afternoon or evening disrupts sleep by suppressing melatonin — contributing to insomnia and fatigue.

Lorenzo's Oil — The Dietary Therapy

Lorenzo's Oil — a 4:1 mixture of glyceryl trioleate and glyceryl trierucate (oleic acid and erucic acid) — was developed in the 1980s by the parents of Lorenzo Odone, a boy with ALD. When taken as approximately 20% of daily calorie intake alongside a diet restricted in saturated VLCFAs, Lorenzo's Oil normalises plasma VLCFA levels in most patients.

Critically, Lorenzo's Oil does NOT reverse existing neurological damage and has NOT been shown to halt neurological progression once symptoms have appeared. However, in pre-symptomatic males with X-ALD (identified through newborn screening or family testing before brain MRI changes appear), Lorenzo's Oil combined with a low-VLCFA diet reduces the risk of developing cerebral ALD. It remains an important component of management for asymptomatic boys and men with X-ALD.

The Low-VLCFA Diet

The dietary component of Lorenzo's Oil therapy restricts foods high in saturated very-long-chain fatty acids. VLCFAs are found predominantly in:

Animal fats (especially ruminant fat — beef dripping, lamb fat, suet, lard)
Full-fat dairy (butter, cream, full-cream cheese)
Some plant oils (peanut oil, rapeseed/canola at high doses)
Some fish oils (restrict total fat from these sources when on Lorenzo's Oil)

The diet is NOT a low-fat diet overall — Lorenzo's Oil itself provides significant calories from oleic and erucic acid. It is a VLCFA-restricted, oleic-acid-enriched diet. A registered dietitian experienced in peroxisomal disorders must guide this — the balance of fatty acid types must be carefully calculated.

  South African context: The traditional South African braai culture — fatty boerewors, lamb chops, pork ribs — is not compatible with the VLCFA-restricted diet. Lean chicken pieces, fish on the braai (yellowtail, snoek), and vegetable kebabs are better choices for ALD patients at social gatherings.

Dietary Principles for AMN Adults (Beyond Lorenzo's Oil)

For adult men with AMN who may or may not be on Lorenzo's Oil but who want to manage weight:

Calorie balance: Moderate deficit of 250-350 kcal/day maximum. Never attempt crash dieting — cortisol dynamics make severe restriction dangerous.
High protein: 1.2-1.6 g/kg/day to counteract any muscle wasting from cortisol replacement and physical deconditioning from spastic paraparesis.
Complex carbohydrates: Spinal cord disease and limited mobility mean blood sugar stability is important. Oats, legumes, sweet potato, and wholegrain bread provide steady energy without blood sugar spikes.
Sodium and fluid: If on fludrocortisone (mineralocorticoid), adequate sodium intake is needed — do NOT go on a low-sodium diet without specialist input. Hyponatraemia (low sodium) is a risk with over-restriction.
Anti-inflammatory foods: Chronic neuroinflammation drives ALD progression. Oily fish (omega-3), turmeric, olive oil, and colourful vegetables may provide modest anti-inflammatory benefit alongside medical treatment.

Sick Day Rules — Critical Safety Information

Illness, surgery, dental procedures, or significant physical stress can trigger adrenal crisis if cortisol dose is not increased. Every ALD/AMN patient with adrenal insufficiency must know the sick day rules:

Double or triple the hydrocortisone dose during fever (above 38°C), vomiting, or significant illness
If unable to take oral medication (vomiting, unconscious), use the emergency hydrocortisone injection (100 mg IM) immediately and go to the nearest emergency department
Never go more than 24-36 hours without cortisol — adrenal crisis can be fatal
Carry medical alert ID at all times (MedicAlert bracelet is available in South Africa)

Exercise with AMN and Adrenal Insufficiency

Exercise is beneficial but requires careful planning around cortisol replacement:

Exercise Type	Suitable?	Notes
Swimming / hydrotherapy	Excellent	Buoyancy assists with spastic weakness; low fall risk; good for cardiovascular fitness
Stationary cycling	Good	No balance demand; adjustable resistance; safe for spastic paraparesis
Walking (flat, with aids if needed)	Good where possible	Use walking aids as needed; avoid uneven surfaces with balance impairment
Light resistance training	Good with guidance	Preserves upper body strength; avoid heavy lifts that raise cortisol demand sharply
Vigorous HIIT / intense intervals	Caution	Very intense exercise increases cortisol demand — pre-dose with 5 mg hydrocortisone before extended vigorous sessions; discuss with endocrinologist
Running, contact sports	Usually limited	Spastic paraparesis makes these impractical in most AMN cases

Pre-exercise cortisol dosing: For exercise sessions longer than 45-60 minutes at moderate-to-vigorous intensity, taking an additional 5 mg hydrocortisone 30-60 minutes before exercise reduces the risk of fatigue, hypoglycaemia, and cortisol deficiency during the session. This is especially important for hot-weather exercise (outdoor exercise in a South African summer).

Haematopoietic Stem Cell Transplantation (HSCT) Considerations

For boys with childhood cerebral ALD (CCALD) with early MRI changes, HSCT can halt cerebral demyelination. Post-transplant nutrition is managed by the transplant team. Weight gain from post-transplant immunosuppression (corticosteroids, cyclosporine) is common and should be addressed gradually once the transplant is stable — discuss timing with the treating team.

Gene therapy (Skysona / elivaldogene autotemcel) received European approval for early CCALD and represents a significant advance. Nutritional support post-gene-therapy follows the transplant-like protocols of the treating centre.

Accessing Care in South Africa

ALD/AMN is managed by a combination of metabolic physicians, neurologists, and endocrinologists. The main centres are at Wits Donald Gordon Medical Centre (Johannesburg), Red Cross War Memorial Children's Hospital (Cape Town), and Steve Biko Academic Hospital (Pretoria). The ALD/AMN Alliance (international) provides patient support resources accessible to South African families.

  Key takeaways:
  Adrenal insufficiency management comes first — cortisol replacement must be optimised before weight management begins
Never fast or crash diet with adrenal insufficiency — hypoglycaemia and adrenal crisis risk
Lorenzo's Oil normalises plasma VLCFAs in pre-symptomatic patients — it does not reverse existing neurological damage
Pre-exercise cortisol dosing prevents exercise-induced cortisol deficiency for vigorous sessions
Carry emergency hydrocortisone injection and MedicAlert ID at all times
Over-replacement of hydrocortisone causes weight gain — get the dose right with your endocrinologist

More rare condition guides: Browse our full library of South African weight management articles for conditions including Addison's Disease, adrenal tumours, and other endocrine disorders.

Sources: Engelen M et al., "X-linked adrenoleukodystrophy," Neurology 2012; Moser HW et al., "Lorenzo's Oil therapy," Ann Neurol 2005; Huffnagel IC et al., "Adrenal insufficiency in ALD," Orphanet J Rare Dis 2019; South African Addison's Disease Support Group; Orpha.net ALD entry; NORD rare disease database.

This article is for educational purposes only. It does not constitute medical advice. Always consult qualified healthcare professionals for diagnosis, treatment, and dietary guidance specific to your situation.