Weight Loss with Autoimmune Polyglandular Syndrome (APS-2) in South Africa

Autoimmune Polyglandular Syndrome Type 2 (APS-2), also known as Schmidt Syndrome, is the most common of the polyglandular autoimmune syndromes. It involves the immune system simultaneously attacking multiple hormone-producing glands — most often the adrenal glands (Addison's disease), the thyroid (Hashimoto's thyroiditis or Graves' disease), and the pancreatic beta cells (Type 1 Diabetes Mellitus). When two or more of these are present in the same person, APS-2 is the diagnosis. For South Africans living with APS-2, managing body weight is a genuine challenge — not because of lifestyle choices, but because multiple hormonal systems are disrupted simultaneously, each pulling weight in different directions. This guide unpacks the weight management puzzle of APS-2 and offers practical, locally relevant guidance.

Understanding APS Type 2

APS-2 is strongly linked to HLA class II alleles — particularly HLA-DR3 and HLA-DR4 — meaning there is a significant inherited susceptibility. However, environmental triggers (viral infections, stress, other immune events) appear necessary to initiate the autoimmune cascade. APS-2 predominantly affects adults aged 20–60 and is more common in women (female-to-male ratio approximately 3:1).

Components of APS-2:

• Addison's disease (primary adrenal insufficiency): The adrenal glands are destroyed by autoimmune attack, reducing or eliminating cortisol and aldosterone production. Cortisol is the body's primary stress hormone; aldosterone controls sodium and potassium balance. Addison's causes profound fatigue, weight loss, low blood pressure, salt craving, darkening of skin (hyperpigmentation), nausea, and abdominal pain.
• Hashimoto's thyroiditis / autoimmune hypothyroidism: Immune destruction of the thyroid gland reduces thyroid hormone output. Causes weight gain, fatigue, cold intolerance, constipation, dry skin, hair loss, brain fog, and depression. (Graves' disease — the hyperthyroid variant — causes the opposite: weight loss, heat intolerance, palpitations.)
• Type 1 Diabetes Mellitus (T1DM): Immune destruction of pancreatic beta cells eliminates insulin production. Causes high blood glucose, weight loss before diagnosis, and complex ongoing weight fluctuations tied to insulin therapy.

Other conditions that can co-occur in APS-2:

• Vitiligo (patchy skin depigmentation — most common associated feature)
• Alopecia areata (autoimmune hair loss)
• Pernicious anaemia (B12 malabsorption)
• Coeliac disease (gluten-triggered gut autoimmunity)
• Myasthenia gravis (autoimmune neuromuscular disorder)
• Primary ovarian insufficiency

How APS-2 Affects Weight: A Complex Multi-Hormonal Picture

Each component of APS-2 has opposing effects on weight — making interpretation without blood tests nearly impossible:

• Active Addison's disease (untreated): Causes profound unintentional weight loss, dehydration, muscle wasting. In crisis, life-threatening. Once treated with hydrocortisone and fludrocortisone, weight typically recovers — and corticosteroid replacement can overshoot, causing weight gain.
• Hypothyroidism (Hashimoto's): Slows metabolism significantly. Even at rest, the body burns fewer calories. Weight gain is very common — typically 3–8 kg — and resists loss until thyroid hormone (levothyroxine) is adequately dosed.
• T1DM before diagnosis: Severe unintentional weight loss as the body breaks down fat and muscle for energy due to insulin deficiency. After starting insulin therapy, weight rapidly recovers — and may overshoot.
• T1DM with insulin therapy: Weight management is complicated by the need to prevent hypoglycaemia (low blood sugar). Treating hypos with fast-acting carbohydrates adds calories. Insulin itself promotes fat storage.
• Corticosteroid replacement (Addison's): Physiological replacement doses (typically 15–25 mg hydrocortisone/day in divided doses) are necessary for life. If doses are too high, or if the patient is given older dexamethasone-based regimens, Cushingoid weight gain can occur.

The bottom line: body weight in APS-2 fluctuates dramatically depending on which conditions are currently most active and how well-controlled each is. Weight tracking is meaningless without concurrent biochemical monitoring of cortisol, thyroid, and blood glucose status.

The First Priority: Get All Components Well-Controlled

Before focusing on intentional weight loss, every component of APS-2 must be properly diagnosed and adequately treated:

• Addison's disease: Hydrocortisone (twice or thrice daily) + fludrocortisone for aldosterone replacement. Sick-day rules (doubling hydrocortisone doses during illness) are life-saving — all APS-2 patients should carry an emergency injection kit (hydrocortisone 100 mg IM) and a medical alert bracelet.
• Hypothyroidism: Levothyroxine (T4 replacement). Dose must be optimised to TSH in the lower half of the normal range (approximately 0.5–2.0 mU/L). Under-treated hypothyroidism makes weight loss essentially impossible.
• T1DM: Insulin therapy — basal-bolus regimen or insulin pump. Tight glucose control (HbA1c below 53 mmol/mol or 7%) reduces long-term complications but requires vigilance about hypoglycaemia.

Only once each component is adequately replaced and stable should intentional weight loss be a focus. Attempting calorie restriction while Addison's is under-replaced or thyroid is under-treated is futile and potentially dangerous.

Dietary Strategy for APS-2 in South Africa

APS-2 dietary management involves balancing the needs of each co-existing condition. Here is how to navigate the overlapping requirements:

Base diet: Mediterranean anti-inflammatory approach

• Abundant vegetables at every meal — morogo, spinach, broccoli, cabbage, tomatoes, peppers
• Legumes as primary protein source: lentils, chickpeas, sugar beans — high fibre, low GI, affordable
• Fatty fish twice weekly: tinned sardines, pilchards, or fresh mackerel for anti-inflammatory omega-3
• Olive oil as primary cooking fat
• Whole grains: oats, brown rice, samp, whole-wheat bread
• Fresh fruit in moderate portions (2 per day)
• Rooibos tea: naturally caffeine-free, rich in antioxidant polyphenols, zero calories. Drink freely throughout the day. An excellent South African alternative to sweetened drinks or caffeinated beverages that can affect cortisol and blood glucose.

Addison's disease-specific considerations:

• Do not restrict sodium: Unlike standard dietary advice, APS-2 patients with Addison's disease should NOT follow a low-salt diet unless fludrocortisone dose is well-optimised. Aldosterone deficiency causes sodium wasting — adequate dietary salt is important. Salt your food to taste, use biltong occasionally (its salt content is useful here), and include naturally salty foods like olives and cheese in moderation.
• Increase salt during hot weather and exercise: Sweating removes sodium that Addison's patients cannot retain normally. Add extra salt to meals on hot South African summer days or after any significant physical activity.
• Potassium caution: Aldosterone deficiency causes potassium retention. Avoid very high potassium foods in large quantities (excessive banana, avocado, spinach) until fludrocortisone is optimised and biochemistry is stable.
• Never fast: Prolonged fasting can trigger an adrenal crisis in Addison's disease. Never attempt intermittent fasting (16:8, OMAD, 24-hour fasts) without explicit endocrinologist guidance and crisis preparation.

Hashimoto's hypothyroidism-specific considerations:

• Selenium: Brazil nuts (2–3 per day) provide selenium, which supports thyroid enzyme function and may modestly reduce thyroid antibody levels. One Brazil nut per day is enough — do not over-supplement.
• Iodine balance: Avoid extremes — neither severe iodine deficiency nor excess. Standard iodised salt is fine. Avoid mega-dose iodine supplements or kelp supplements.
• Goitrogenic foods in moderation: Raw cruciferous vegetables (broccoli, cabbage, kale) in very large raw quantities can theoretically impair thyroid. Normal dietary portions (cooked or raw) are completely safe. Do not avoid them.
• Coeliac screening: Coeliac disease co-occurs in APS-2 more than in the general population. If gluten elimination improves energy and gut symptoms, request coeliac antibody testing before eliminating gluten permanently.
• Levothyroxine timing: Take levothyroxine on an empty stomach, 30–60 minutes before breakfast, with water only. Coffee, calcium, and iron supplements all reduce absorption.

Type 1 Diabetes-specific considerations:

• Carbohydrate counting: T1DM management with insulin requires carbohydrate awareness. A registered dietitian trained in T1DM (insulin-to-carb ratios) is essential.
• Low GI but not very low carb: Very low carbohydrate (Banting-type) diets in T1DM can work but require significant insulin dose adjustment and close monitoring — not to be attempted without specialist guidance.
• Hypo treatment calories: Each hypoglycaemia episode treated with glucose (fruit juice, Jelly Babies, glucogel) adds calories. Optimising insulin regimen to reduce hypo frequency is the most effective strategy — more important than any dietary change.
• Alcohol risk: Alcohol causes late-onset hypoglycaemia in T1DM (up to 8 hours later). In the context of APS-2 with Addison's, alcohol also suppresses the cortisol response that normally defends against hypos. Avoid or consume with extreme caution — never drink on an empty stomach.

Exercise with APS-2

Exercise is beneficial in APS-2 but requires planning around each component:

General principles:

• Pre-exercise hydrocortisone dose (Addison's): Strenuous exercise is a physiological stress that normally triggers cortisol release. Addison's patients cannot do this. For moderate-to-vigorous exercise lasting over 30–45 minutes, most endocrinologists recommend taking an extra 5 mg hydrocortisone immediately before. Confirm the protocol with your specialist.
• Carry glucose and hydrocortisone: Never exercise without fast-acting glucose (glucose tablets or juice) and your emergency hydrocortisone injection kit within reach.
• Blood glucose management (T1DM): Exercise lowers blood glucose in T1DM — reduce basal insulin or increase carbohydrate intake before planned exercise. Your diabetes care team can advise on specific adjustments.
• Hydration and salt replacement: South African summers are hot. APS-2 patients with Addison's sweat out sodium that they cannot retain normally. Add a pinch of salt to your water bottle or use electrolyte sachets (avoiding sugar-heavy sports drinks).

Recommended exercise types:

• Walking: 30 minutes daily is an excellent starting point. Consistent, moderate, easy to plan around glucose and cortisol management.
• Swimming: Excellent cardiovascular exercise with manageable glycaemic effects and low joint stress.
• Resistance training (weight training): Builds muscle mass, improves insulin sensitivity, and increases resting metabolic rate. Particularly beneficial if hypothyroidism has reduced muscle mass. Start light and build gradually.
• Yoga and Pilates: Stress management benefit is significant — chronic stress raises cortisol need and can destabilise Addison's management. Mind-body practices reduce sympathetic nervous system activity.

Exercise cautions:

• Never exercise when blood glucose is below 5 mmol/L in T1DM — treat first
• Never exercise during an Addisonian crisis or when feeling unusually unwell
• Inform your gym trainer or exercise partner that you have adrenal insufficiency and T1DM — they should know how to recognise and respond to a crisis
• Wear a medical alert bracelet at all times during exercise

Monitoring and Screening in APS-2

APS-2 requires regular screening for additional autoimmune conditions and biochemical monitoring:

• Annual thyroid panel: TSH and free T4 — especially important for dose adjustment if weight changes significantly
• Annual HbA1c: Reflects 3-month average blood glucose control
• Annual electrolytes: Sodium and potassium to assess fludrocortisone adequacy
• Annual morning cortisol (9 am): Or short Synacthen test to verify adrenal status
• Coeliac antibodies (anti-tTG IgA): Screen at diagnosis and repeat if GI symptoms emerge
• B12 level: Screen for pernicious anaemia (co-occurs in APS-2)
• Bone density (DEXA scan): Chronic cortisol replacement, even at physiological doses, carries long-term bone loss risk

Finding Specialist Care in South Africa

APS-2 is best managed by an endocrinologist with experience in adrenal and autoimmune conditions. In South Africa:

• Endocrinologists: Find an SEMDSA (Society of Endocrinology, Metabolism and Diabetes of South Africa) member at semdsa.co.za
• Diabetes educators: The ADSA (Association for Dietetics in South Africa) register includes T1DM-specialist dietitians at adsa.org.za
• Addison's disease support: The Addison's Disease Self-Help Group (adshg.org.uk) provides widely used patient resources applicable to SA patients
• Rare Diseases South Africa: rdsa.co.za for connection with other APS-2 families and rare endocrine condition resources
• Medical alert bracelets: Available from MedicAlert South Africa (medicalert.co.za) — non-negotiable for Addison's patients

Key Takeaways

• APS-2 involves simultaneous autoimmune attack on multiple endocrine glands — most commonly adrenal (Addison's), thyroid (Hashimoto's), and pancreas (T1DM)
• Weight fluctuates dramatically depending on which conditions are active and how well each is treated — normalising biochemistry must come before intentional weight loss
• Addison's patients should NOT restrict sodium and should NEVER fast without specialist guidance
• Under-treated hypothyroidism makes weight loss nearly impossible — ensure thyroid is optimally replaced first
• T1DM insulin management and hypo-treatment calories complicate weight control — work with a specialist dietitian on carbohydrate counting
• Exercise requires pre-exercise cortisol dosing (Addison's), glucose management (T1DM), and always carrying emergency supplies
• Annual screening for coeliac disease, pernicious anaemia, and bone density is essential
• A South African endocrinologist experienced in adrenal and autoimmune conditions is the cornerstone of APS-2 management

Disclaimer: This article is for informational purposes only and does not constitute medical advice. Autoimmune Polyglandular Syndrome Type 2 is a serious multi-system condition requiring specialist management. Never adjust steroid, thyroid, or insulin doses without explicit guidance from your endocrinologist. Consult your healthcare team before making any dietary or exercise changes.

Sources: Kahaly GJ (2009). Polyglandular autoimmune syndromes. European Journal of Endocrinology 161(1). | Betterle C et al. (2002). Autoimmune adrenal insufficiency and autoimmune polyendocrine syndromes. Endocrine Reviews 23(3). | Society of Endocrinology, Metabolism and Diabetes of South Africa (SEMDSA): semdsa.co.za.