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Micronutrient deficiencies (including iodine and iron deficiency) is a global health problem affecting one third of the world's population. Salt is an ideal carrier for food fortification as it is universally consumed at equal rates, independently of economic status, and it is industrially processed. Addressing iron and iodine deficiencies together is a challenge, due to interaction between iodine and iron, negating the effect of added iodine. This paper explains the development of an improved microencapsulation-based technology to produce iron premix, which, when added to iodized salt, is stable and organoleptically indistinguishable. Ferrous fumarate was extruded, followed by cutting, sieving to achieve a size of 300-710 μm (salt grain size). Agglomerated extrudates were microencapsulated (5% hydroxypropyl methylcellulose and 5% soy stearin) to form iron premix. Microencapsulation ensures that the added micronutrients are stable without interaction or degradation. Double Fortified Salt is formed by blending iron premix with iodized salt (1:200 ratio). This technology was transferred to India for industrial scale-up. The public distribution system was utilized to establish and monitor an efficient distribution network for DFS in a transparent manner. The scale-up process was initially demonstrated in the state of Uttar Pradesh, following its success two more Indian states have started distribution of DFS. At present, the DFS with iron and iodine is reaching 60 million people in India. This important health intervention technology through food fortification has the potential to be scaled globally to ensure a world free from iron deficiency anemia., (© 2019 The Authors. Maternal & Child Nutrition Published by John Wiley & Sons Ltd.)

Objective: We aimed to review the English and Chinese literature on Pa Ping and to confirm by personal interview the story of how its pathogenesis was uncovered., Background: In 1930, Dr. Alexander Stewart Allen noticed a pattern of illness arising in the region of Kiating, China. Area residents began presenting to local hospitals with nausea, vomiting, and diarrhea, and what emerged was a clinical picture of a gradual ascending paralysis that could result in death, termed Pa Ping. All 3 patients observed by Dr. Allen were male, had no family history of the disease, and had recently eaten before the onset of paralysis. Pa Ping developed in Dr. Allen himself, but he survived., Methods: Medical literature was reviewed for primary sources. Interviews of living descendants and friends of the doctors in China and North America were conducted and information was corroborated by written records., Results: Dr. Huang, with the National Central University College of Medicine, noticed a striking similarity between Pa Ping and familial periodic paralysis in 12 patients and reported 2 patients with Pa Ping treated with potassium citrate who experienced a reversal of the paralysis. Dr. K.T. Du analyzed meals of patients with Pa Ping seen by Dr. Zhe Tung and found barium in concentrations as high as 25.7%. This finding was confirmed by administering barium chloride to animals, which recapitulated the human syndrome., Conclusions: Although Dr. Huang had correctly noticed an underlying potassium depletion in patients with Pa Ping, the observations of Dr. Zhe Tung and Dr. K.T. Du ultimately established barium-induced hypokalemia as the underlying cause.