Food vitamins and minerals can lead to diseases that can have far-reaching effects on health. For instance, 30% of the world's population either has, or is at risk for developing, iodine deficiency. It is estimated that at least 3 million children are blind due to vitamin A deficiency. Vitamin C deficiency results in scurvy. Calcium, Vitamin D, and phosphorus are inter-related; the consumption of each may affect the absorption of the others. Kwashiorkor and marasmus are childhood disorders caused by lack of dietary protein. Many individuals limit what foods they eat for reasons of morality, or other habit. For instance, vegetarians
In the Days of the Comet he had been a great success at the university." Leadford's only close friend is a fellow clerk and socialist. But the pair quarrel and Leadford breaks off relations when Parload avers that socialism is "only a theory," whereas science is "something more". In later years Parload becomes a great scientist whose "work upon intersecting radiations has broadened the intellectual horizon of mankind for ever." Wells's open endorsement of polyamorous love at the end of "In the Days of the Comet" caused some scandal. Various organisations dedicated to preserving public morals, including the YWCA, Salvation Army and ‘Anti-Vice and White Slavery’