Mycotoxins are secondary metabolites produced by filamentous fungi in food and feed due to several conditions that affect fungal growth and mycotoxin production in different ways. This review aims to explore the different factors that affect mycotoxin production and their control methods. Environmental conditions such as high temperature and humidity increase the risk of fungal growth and mycotoxin production. Other factors that affect contamination include pH, fungal strain, and substrate. To control mycotoxin contamination an integrated approach that starts in the field prior to planting and continues throughout the whole food chain is required, so good practices help minimize contamination at every step to deliver safe products. Good practices include proper practices on the field before and after planting, good harvest practices, appropriate drying measures, and good storage practices. Mycotoxin contamination is inevitable in food and once present they tend to remain as they are very stable compounds, although several physical, chemical and biological techniques could be applied to help minimize contamination. Food processing may also play a minimal role in controlling mycotoxins. Finally, regulations serve to keep food markets free from highly contaminated products, while proper sampling procedures and analytical methods ensure regulations endorsement.

Brewers’ spent grains constitute a valuable byproduct of the beer industry. They are characterized by a rich nutritional composition consisting of around 70% lignocellulosic fibrous material, 20% proteins, 10% lipids, in addition to vitamins, minerals, amino acids, and phenolic compounds. These spent grains are produced in large amounts all through the year, are cheap, and lack economically feasible applications. Nowadays, 70% of these spent grains are used as animal feed, 10% are used for biogas production, and the remaining 20% are disposed in landfills. Due to the aforementioned facts, alternative uses of the brewers’ spent grains are highly sought-after. In fact, this nutrient-rich industrial by-product makes it a very good candidate for valorization through biotechnological processing, particularly microbial fermentation. After applying the needed pretreatments, using brewers’ spent grains as a substrate in submerged and solid-state fermentation of different microorganisms leads to the production of various value-added compounds such as organic acids, amino acids, volatile fatty acids, enzymes, vitamins, second-generation biofuels and other products.