what is good weigh-loss diet?

Question

In the summer, I am planning to eat...

breakfast: banana/apple

lunch: any kind of salad

dinner: a sandwich

is this diet good to lose at least 20 pounds in 3 months?

Answer 1

not really. your plan doesnt have enough calories and when you undereat you only lose water weight and muscle and also slow down metabolism and then gain even more than lost back as soon as you start eating normal.
find calorie/fitness calculator on the net, enter all your stats and it will tell you how many calories you need a day to maintain, take off 300-400cal off that number and thats how much you need to lose.
eat 5-6 small meals a day (eat every 2-3 hours)
5-8 servings of fruit and veggies a day
8 glasses of water
have complex carbs for breakfast - they give you energy
have lean meat (protein) for dinner - repairs muscle
cardio exercise 4-6 times a week for 30-50min, light weight training
dont consume foods that are made of white flour (white bread, cakes, past etc.), sugar loaded foods (cookies, icecream, candy etc) and nothing fried, oily.
ofcourse you can spoil yourself once in a while with a little treat:)

Answer 2

Firstly, the most weight a human can safely lose a week is 3 pounds.

Secondly, you will not be eating nearly enough calories, which means you will be depriving your body of the nutrients and energy it needs to run properly.

You need to eat at least 1200 calories a day at the very least, and you need to eat more protein.

Breakfast is the most important meal of the day, and starting out with just a piece of fruit is going to sabotage your entire day.

I recommend eating 6 small but healthy meals a day, lots of vegetables and fruits, lean proteins, and whole grains. But do not, whatever you do, starve yourself the way you're planning to.