It is possible to major in any academic discipline and still complete the science courses required for health professions schools. Schools do not have a preference for any major. You should focus in whatever area you find exciting and appealing. Some students will enroll in the minimal science requirements and choose to major in the social sciences or humanities, reasoning that this will be the only time they can study a non-science area in depth. Other students decide that they really want to study a particular science in depth, or they find that because of the science requirements of the schools to which they are applying, it is easier to major in a science.
Note that double majors can be difficult to fit in, they often require you to enroll in courses you are not very interested in, and they offer no advantages to an applicant. Completing two majors or a minor or certificate will NOT make you more competitive. Instead, you should be taking challenging courses that further your interests and talents and that allow you to see an area of interest from many different perspectives.
Health professions schools evaluate your curriculum by looking at the courses you take, whether you take upper level (300, 400 level) and graduate (500, 600) courses, the rigor of your semesters (multiple labs, overloading), and the addition of research independent studies or an honors thesis. Completing three or four courses in an academic area may give you a satisfying, solid foundation without having to fulfill additional requirements of a second major, minor, or certificate.