According to the Children's Defense Fund, children who do not have access to proper nutrition are much more likely to suffer from psychological disorders, such as anxiety or learning disabilities. These children are also significantly more likely to require mental health counseling. Poor nutrition negatively impacts a child's ability to develop properly and adapt normally to certain situations. A study in the "Indian Journal of Psychiatry" in 2008 noted a link between iron deficiency and hyperactivity disorders in children. Iodine deficiency has also been linked to some developmental impairments. Certain nutritional habits that children may be prone to, such as skipping meals or overindulging in sugary foods, have also been linked to depression. Additionally, these mental and emotional health problems in children are often reinforced by obesity and low self-esteem, which may be the result of poor nutrition.