Journal September 26, 2026 7 min read

How Does Thermogenesis Work?

Thermogenesis is the metabolic production of heat, driven by mitochondrial uncoupling and adrenergic signalling in brown and beige adipose tissue. This page outlines the mechanistic evidence, including animal and in vitr

peptides-pro Editorial

Thermogenesis is the biological production of heat through metabolic processes. It encompasses several distinct phenomena: shivering thermogenesis, which occurs in skeletal muscle; non-shivering thermogenesis, which takes place primarily in brown adipose tissue (BAT) and beige adipocytes; and diet-induced thermogenesis (DIT), the energy expended in digesting, absorbing, and processing nutrients [6]. The term 'adaptive thermogenesis' refers to the regulated dissipation of energy as heat in response to cold or overfeeding. At the cellular level, thermogenesis in brown and beige adipocytes is mediated by uncoupling protein 1 (UCP1), which allows protons to leak across the inner mitochondrial membrane, bypassing ATP synthase and releasing energy as heat. The evidence block for this page does not provide sequence, formula, or molecular weight identifiers for UCP1 or other thermogenic proteins.

The work described here centres on the adrenergic signalling axis and its modulation of adipose tissue thermogenesis, particularly the browning of white adipose tissue (WAT) and the activation of BAT. This pathway involves beta-adrenergic receptors, downstream effectors such as AMP-activated protein kinase (AMPK), and a range of adipokines and exogenous compounds that influence thermogenic gene programmes.

Research Studies

FSTL1 and WAT browning in male mice

Follistatin-like 1 (FSTL1) is an adipokine implicated in white adipose tissue biology. In male mice housed at ambient room temperature, overexpression of FSTL1 induced WAT browning, enhanced energy metabolism, and promoted glucose uptake [2]. When FSTL1 was overexpressed specifically in WAT, it prevented metabolic dysfunction in mice with diet-induced obesity. Conversely, mice deficient in FSTL1 exhibited cold intolerance and were prone to obesity. The study reported that FSTL1 cannot directly induce thermogenesis in adipocytes, suggesting that its effects on WAT browning are mediated indirectly, possibly through crosstalk with sympathetic nerves [2]. These findings are animal-only.

Sulforaphane and metabolic dysfunction in obesity models

Sulforaphane, an isothiocyanate derived from broccoli and other cruciferous vegetables, has been evaluated in the context of obesity and obesity-related metabolic dysfunction. A narrative review examined its antioxidant, anti-inflammatory, and metabolic regulatory properties, with mechanistic insights drawn from preclinical evidence and clinical perspectives [3]. The review critically evaluates the evidence base, but the available excerpt does not specify thermogenic outcomes or the populations in which effects were observed. This evidence is therefore not sufficient to support claims about sulforaphane's direct role in thermogenesis.

GIPR agonism and antagonism in obesity pharmacotherapy

Glucagon-like peptide-1 receptor (GLP-1R) agonists have transformed obesity pharmacotherapy, but their efficacy is constrained by dose-limiting gastrointestinal adverse effects. The next generation of obesity therapeutics aims to expand the therapeutic window by dissociating metabolic efficacy from aversive side effects [4]. Dual GLP-1R/glucose-dependent insulinotropic polypeptide (GIP) receptor agonists have shown clinical success, catalysing renewed interest in GIPR signalling. The evidence block does not specify whether these agents directly modulate thermogenesis, and no thermogenic outcomes are reported in the excerpt.

Systemic vibration therapy and thermogenesis in adults with obesity

A clinical trial evaluated the effects of Systemic Vibration Therapy (SVT) on thermogenesis, cardiovascular parameters, endocrine-inflammatory markers, and physical-functional performance in adults with obesity (men and women, aged 18–59) [5]. The trial compared two types of vibrating platforms (vertical and side-alternating) to a placebo group in which the platform was turned off but simulated the sound. The main questions addressed whether SVT affected thermogenesis and physical-functional performance, and how it influenced cardiovascular risk, hormone levels, and inflammation. This study was conducted in humans with obesity.

Diet-induced thermogenesis and caloric intake

Diet-induced thermogenesis (DIT) is the energy used to eat food, absorb nutrients, and process them. A clinical trial investigated how changing the balances of protein, fat, carbohydrates, and total calories in the diet affect DIT in healthy people aged 18 to 60 years who had not intentionally lost weight in the past 6 months [6]. Participants stayed in a clinic for about 35 days and received 8 different diets, including 7 test diets. The study aimed to learn how different diets change a person's DIT. This research was conducted in humans.

Postprandial gut hormones and meal-induced thermogenesis in type 1 diabetes

A study compared postprandial responses to a test meal between subjects with type 1 diabetes and healthy control subjects, focusing on gut hormone levels, meal-induced thermogenesis, hunger and satiety perception, and further metabolic parameters [7]. The study population comprised patients with type 1 diabetes mellitus and healthy controls. The evidence block does not report results.

Long-term weight loss and meal-induced thermogenesis

A study examined post-prandial gut-hormone secretion, meal-induced thermogenesis, fasting plasma metabolomic/lipidomic and cardiovascular indices among surgically managed obese individuals in the long term compared to conservatively managed obese patients [8]. The study population consisted of obese individuals managed surgically or conservatively. The evidence block does not report results.

Mazdutide in type 2 diabetes with NAFLD

A multicenter, prospective, randomized controlled investigator-initiated trial is evaluating the efficacy and safety of switching to mazdutide therapy in patients with type 2 diabetes mellitus (T2DM) and moderate-to-severe non-alcoholic fatty liver disease (NAFLD) who have achieved glycemic control [1]. The study focuses on Chinese patients with T2DM, who are susceptible to visceral fat accumulation, and in whom metabolic associated fatty liver disease (MAFLD) is highly prevalent. The coexistence of T2DM and moderate-to-severe fatty liver significantly elevates liver-related and all-cause risks. The evidence block does not report thermogenic outcomes for mazdutide.

Canagliflozin and adipocyte thermogenesis in vitro

Canagliflozin (CANA) exhibits anti-obesity effects in clinical practice, but its direct adipocyte-intrinsic functions are poorly understood. In a study using 3T3-L1 preadipocytes, CANA promoted differentiation and enhanced lipid mobilization and thermogenesis through an AMPK/autophagy-dependent mechanism [9]. This finding is from an in vitro cell model and is marked REFERENCE ONLY; it is reported here as a fact from the cited paper.

Forskolin and de novo beige adipogenesis in adipose stem cells

White adipose tissue browning is a strategy to combat obesity and metabolic disorders, but current browning inducers often suffer from off-target effects and poor durability. Beige adipocytes can arise through de novo differentiation from adipose-derived stromal/stem cells (ASCs). A study investigated adipose stem cell-targeted local delivery of forskolin to induce de novo beige adipogenesis and adipose tissue browning [10]. This finding is from a preclinical model and is marked REFERENCE ONLY; it is reported here as a fact from the cited paper.

EGCG and BAT-independent thermogenic switch in subcutaneous adipose tissue

Dysfunctional adipose tissue drives metabolic and immune dysregulation in obesity. Adaptive thermogenesis is a promising therapy, but its efficacy is limited by low brown adipose tissue (BAT) activity. Epigallocatechin gallate (EGCG) has anti-obesity effects, and a study investigated whether it can trigger a BAT-independent thermogenic switch and remodel the immune microenvironment in subcutaneous adipose tissue [11]. This finding is from a preclinical model and is marked REFERENCE ONLY; it is reported here as a fact from the cited paper.

Time-restricted feeding and HIIT in diabetic rats

A study evaluated the independent and combined effects of time-restricted feeding (TRF) and high-intensity interval training (HIIT) on thermogenesis-related protein abundance in white adipose tissue (WAT) of diabetic rats. Forty male Wistar rats were divided into normal and diabetic groups [12]. This finding is from an animal model and is marked REFERENCE ONLY; it is reported here as a fact from the cited paper.

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