People who are more likely than others to have trouble getting enough zinc:

The following is extracted from

http://ods.od.nih.gov/factsheets/Zinc-QuickFacts/?print=1

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Certain  groups of people are more likely than others to have trouble getting enough zinc:

• People who have had gastrointestinal surgery, such as weight loss surgery, or who havedigestive disorders, such as ulcerative colitis or Crohn's disease. These conditions can both decrease the amount of zinc that the body absorbs and increase the amount lost in the urine.
• Vegetarians because they do not eat meat, which is a good source of zinc. Also, the beans and grains they typically eat have compounds that keep zinc from being fully absorbed by the body. For this reason, vegetarians might need to eat as much as 50% more zinc than the recommended amounts.
• Older infants who are breastfed because breast milk does not have enough zinc for infants over 6 months of age. Older infants who do not take formula should be given foods that have zinc such as pureed meats. Formula-fed infants get enough zinc from infant formula.
• Alcoholics because alcoholic beverages decrease the amount of zinc that the body absorbs and increase the amount lost in the urine. Also, many alcoholics eat a limited amount and variety of food, so they may not get enough zinc.
• People with sickle cell disease because they might need more zinc.