A review on the heavy metal adsorption capacity of dietary fibers derived from agro-based wastes: Opportunities and challenges for practical applications in the food industry

•Agricultural waste materials are alternative materials for heavy metal adsorption.•Dietary fiber (DF) can adsorb and bind detrimental elements including heavy metals.•Reviewed disputes and prospects of DF for heavy metal adsorption in food industry.•Adsorption capacity can be significantly enhanced using modification technologies.