Temple syndrome — also called maternal uniparental disomy 14 (upd(14)mat) or chromosome 14q32 imprinting disorder — results from abnormal expression of imprinted genes in the 14q32 region. Genomic imprinting means that certain genes are "parent-of-origin specific": only the maternal copy or only the paternal copy is expressed. In Temple syndrome, there is either:
The result is overexpression of maternally-derived genes, particularly DLK1 (delta-like homolog 1) — a gene with critical roles in fat cell (adipocyte) development, growth hormone regulation, and puberty timing. Reduced DLK1 activity leads to early-onset obesity and premature puberty.
Globally, Temple syndrome is rare but probably underdiagnosed — it is estimated to affect 1 in 10 000 to 1 in 20 000 individuals. It is frequently misdiagnosed as Prader-Willi syndrome in early childhood due to significant clinical overlap.
Always work with a clinical geneticist, paediatric endocrinologist, and specialist dietitian. This article is educational only.
The most challenging feature of Temple syndrome for weight management is persistent hyperphagia — an abnormally strong and constant drive to eat, similar to but typically milder than that seen in Prader-Willi syndrome. This is neurobiological, not behavioural. It results from disrupted hypothalamic satiety signalling driven by abnormal imprinted gene expression.
Children and adults with Temple syndrome do not feel full in the normal way. They can eat a complete meal and, within minutes, genuinely experience hunger again. This is not manipulation or greed — it is a neurological symptom. Understanding this is critical for both carers and the affected person.
Central precocious puberty occurs in the majority of individuals with Temple syndrome — often between ages 5 and 8. Early puberty causes:
Many children are treated with GnRH analogues (puberty-blocking hormones) to slow premature puberty and improve final height. This treatment does not directly affect weight management.
DLK1 plays a role in muscle development. Some individuals with Temple syndrome have reduced muscle mass relative to fat mass — a body composition that lowers basal metabolic rate and makes weight loss harder. Growth hormone deficiency has been documented in a subset of patients and, where present, can be treated with growth hormone therapy.
Infants with Temple syndrome typically have significant hypotonia and feeding difficulties. These usually improve with age but may leave residual low muscle tone that affects exercise capacity in childhood.
The key insight is that fighting hyperphagia through willpower alone is futile — the signal never turns off. Instead, the dietary strategy must work with the neurobiology: use food composition and structure to maximise satiety signals and slow gastric emptying, while maintaining a caloric deficit.
Volume eating — eating large physical quantities of low-calorie-density foods — is the single most effective strategy for hyperphagia management. It takes advantage of mechanical stomach stretch receptors (which do signal satiety, even when neurological satiety is impaired) to reduce hunger:
| Food | Volume per 100 kcal | SA Example |
|---|---|---|
| Cucumber | Very large (about 700 g) | Sliced with vinegar dressing |
| Spinach / lettuce | Large (about 500 g) | Mixed salads as base for every meal |
| Butternut soup | Large (about 400 ml) | Blended without cream; filling starter before main |
| Lentil soup | Moderate-large | High fibre + protein = superior satiety |
| Apple | Moderate (about 200 g) | Whole apple > apple juice; fibre slows digestion |
| Oats (cooked) | Moderate | Proats (protein oats): oats + egg whites cooked in |
Protein is the most satiating macronutrient per calorie. For individuals with hyperphagia, prioritising protein at every meal and snack reduces the speed at which hunger returns:
For children with Temple syndrome especially, structured eating times help manage hyperphagia-driven food-seeking behaviour. Studies in Prader-Willi syndrome (which has similar hyperphagia mechanisms) show that predictable mealtimes reduce anxiety around food and food-seeking behaviour:
Low muscle mass in Temple syndrome depresses basal metabolic rate. Building muscle through resistance exercise is one of the most powerful long-term weight management tools — more muscle burns more calories at rest.
Note that exercise can temporarily increase appetite in hyperphagia conditions. Plan post-exercise snacks in advance — a high-protein, high-fibre option like plain yoghurt with berries or a boiled egg works well.
A subset of individuals with Temple syndrome have demonstrable growth hormone (GH) deficiency. GH therapy in this group:
Ask your endocrinologist whether GH stimulation testing is indicated. GH therapy is available in South Africa via paediatric endocrinologists at academic hospitals and is often covered by medical aid under PMB for confirmed GH deficiency.
Raising a child with persistent hyperphagia is exhausting. Parents often feel guilty saying no to food requests from a child who genuinely feels hungry all the time. Key points:
| Check | Frequency | Why |
|---|---|---|
| Growth and weight (children) | Every 3–6 months | Track BMI trajectory against age-appropriate charts |
| Fasting glucose + insulin | Annually from early adolescence | Early insulin resistance screening |
| Lipid panel | Annually | Dyslipidaemia risk with obesity |
| Bone density (DXA) | Every 2–3 years in adults | Reduced muscle mass and early puberty affect bone health |
| Thyroid function | Annually | Thyroid dysfunction can compound weight issues |
| GH stimulation test | Once (if short stature prominent) | Confirm GH status for treatment decision |