INPUT (how you Fuel your body)
Increase water, fresh vegetables, lean protein, and healthy fats (ex. olive oil, avocado, almonds).
Decrease carbohydrates and sugars from artificially processed foods and sweets.
Of all the dietary lifestyles out there, the one with the most robust evidence is the Mediterranean Diet. A great Beginner's Guide can be found at www.everydayhealth.com/mediterranean-diet/guide.
As they say in business, "What gets measured gets managed." Download a calorie tracking app like MacroFactor (macrofactorapp.com) or MyFitnessPal (myfitnesspal.com) and track your daily intake.
Consider practicing Intermittent Fasting, which has been linked to accelerated weight loss, inflammation reduction, reduced cholesterol, lower blood sugar, and better insulin sensitivity. This link provides a great overview: https://jamesclear.com/the-beginners-guide-to-intermittent-fasting.