Inclusion Criteria:  Overweight (BMI ≥ 25 kg/m2) or obese (BMI ≥ 30 kg/m2) with chronic low back pain Non-specific low back pain for at least 3 months' duration Currently seeking care for low back pain Native Dutch speaker Access to internet and computer/tablet/smartphone  Exclusion Criteria:  Leg pain of 7 or higher (on a maximum of 10) on a numeric rating scale Evidence of specific spinal pathology (e.g., hernia, spinal stenosis, spondylolisthesis, infection, spinal fracture or malignancy) Evidence of a severe underlying comorbidity (e.g. diabetes, cardiovascular problems, metabolic diseases) BMI ≥ 40 kg/m2 Being pregnant or given birth in the preceding year Currently receiving dietary or exercise interventions