Eat only 2000 calories a day; 24 hrs. www.thecaloriecounter.com. This link has calories for just about all foods/drinks. The average person will not gain nor lose weight on 2000 cals. a day. If you are eating more than that, cut back and you will lose weight.
Losing 20 lbs in a month is pretty decent weight loss. It's safe so you're good there. Working out in anyway u like- try Zumba if u like to dance it's very fun. Yoga is helpful as well because it works your muscles calmly and helps with other workouts. Eating well and not snacking. But please eat balanced meals. Eating nothing but fruit isn't good for you- your body needs carbs- it's all about how much.