Physiological Needs these are the basic animal needs for such things as food, warmth, shelter, sex, water, and other body needs. If a person is hungry or thirsty or his body is chemically unbalanced, all of his energies turn toward remedying these deficiencies, and other needs remain inactive. If one’s basic biological needs are not met, one would never be able to trust the environment and would be stuck with high neuroticism and anxiety.