Micronutrient deficiency is defined as inadequate intake of essential vitamins and minerals required by the body for proper growth development (WHO, 2016).Vitamins and minerals play important roles in the body for energy production, immune function, brain development, blood clotting, growth, bone health, fluid balance and preventing /fighting diseases such as cancer and Alzheimer (Cardoso, Cominetti, & Cozzolino, 2013). Although our body needs micronutrients in small amounts, an insufficient consumption may cause severe consequences.Deficiencies in vitamin A and D, iodine, folate, zinc and iron are globally the most common, which pose serious health threats to especially children and pregnant women (WHO, 2016). Severe iodine deficiency can lead to brain damage, mental impairment, stillbirth and congenital anomalies (WHO, 2016); while zinc deficiency may cause diarrhea, slow growth in infants, hair loss, delayed sexual development in adolescents, decreased immune response and delayed wound healing (National Institues of Health Office of Dietary Supplements, 2021). Furthermore, a lack of iron, folate and vitamins B and A can lead to 'nutritional anemia' (WHO, 2016).
Iron deficiencyIron deficiency is the most common nutritional deficiency leading to anemia, and is estimated to relate to approximately 50% of all anemia cases in women worldwide (WHO, 2011). Iron plays important roles in biological systems. It helps deliver oxygen to tissues as part of hemoglobin, and contributes to enzyme synthesis, energy production, and regulation of immune functions (Camaschella, 2017). The recommended daily intake varies according to gender and age; to meet iron intake requirements, women should take 25 mg of iron per day, men 12, children 6-10, and infants 1-2 mg (Cayot, Guzun-Cojocaru, & Cayot, 2013). Inadequate iron intake causes iron deficiency anemia which leads to weakness, fatigue, tiredness, dizziness, low work capacity, diminished memory and difficulty in concentrating, and serious health problems in pregnant women and their offspring such as maternal mortality, 5 as diarrhea, abdominal pain, microbiota change, teeth blackening, and risk of acute toxicity from an overdose (Camaschella, 2015(Camaschella, , 2017Thompson, 2007) which disqualifies this approach for long-term and generalized use.Food-based intervention strategies mainly focus on dietary diversification, enhancing the bioavailability of micronutrient and food fortification (WHO, 2017). Iron in food is present in two forms: non-heme and heme iron. The heme form is only provided by food originating from animals such as meat, fish, poultry, and has a higher bioavailability than the non-heme form mainly present in foods of plant origin such as legumes (Blanco-Rojo & Vaquero, 2019). The absorption of non-heme iron is generally improved by adding so-called 'enhancers' such as organic acids, ascorbic, citric or malic acid, whereas 'inhibitors' e.g., phenols, tannins, phytates, phosphate and calcium can counteract this (Thompson, 2007; WHO, 2017). A combined strategy o...