It is normal for body temperature to vary by around 1 degree F throughout a day, typically being lowest after you just wake up, and highest before you go to sleep. Coconut oil typically stimulates the metabolism a bit, as does cayenne pepper, so those might raise your temperature a bit. If you are worried about getting too thin, then you should eat plenty of nuts and seeds(besides peanuts). They are high in calories, high in fiber, high in protein, and high in minerals. They are a great source of magnesium(especially pumpkin and sunflower seeds). Eat more vegetables and drink more water to help prevent constipation. Getting more exercise will also help.