Liquid Diet In order to adhere to a full liquid diet, a person must refrain from consuming any solid foods and instead consume only liquid foods such as soup, juice, and smoothies. For the majority of people, it is a short-term solution rather than a long-term nutritional approach. Full liquids differ from clear liquids in that they contain more solids. Clear liquid diets limit a person's intake of solid foods to clear liquids such as water, tea, and bone broth.