The phrase "drastic dietary changes" refers to significant and sudden alterations in one's eating habits or food choices. This can include cutting out entire food groups, reducing caloric intake, or making other major adjustments to a person's normal diet. The goal of such changes is often to improve health, lose weight, or address specific nutritional needs or restrictions. While drastic dietary changes can be effective in achieving these goals, they should always be done under the guidance of a medical professional and with careful consideration for individual needs and preferences.