Eating too much fat can have serious health consequences, including weight gain, high cholesterol, and an increased risk of heart disease, stroke, and diabetes. Over time, consuming too much fat can cause fatty liver disease and pancreatitis. Eating a diet high in fat can also increase inflammation in the body, which can lead to a range of other health issues. For optimal health, it is recommended to consume no more than 20-35% of your daily calories from fat, and to focus on eating healthy fats like those found in olive oil, avocado, and nuts.