Production of salmon caviar in Russia has halved in the first five months of 2020, while production of caviar substitutes has increased fourfold compared to 2017. The decrease in salmon caviar is due to a poor fish catch in 2020, while the increase in substitutes is due to their affordability. However, the nutritionist explains that while caviar is nutritious, its substitutes do not provide any health benefits and can cause allergies. The article also discusses the potential health benefits and potential allergic reactions to caviar, and suggests consuming it in moderation.