Which lifestyle factors change FT3?

The provided context does not contain any information on lifestyle factors that change FT3. While general knowledge suggests that factors like calorie restriction, stress, sleep, exercise, and iodine intake can influence thyroid hormones including FT3, none of these are mentioned or supported by the given sources. The context discusses unrelated topics such as gut microbiome, MTHFR variants, and lactase persistence. Therefore, no evidence-based answer can be derived from the provided material.