If your concern is obesity and diabetes I encourage you to look up fruititarians. They consume 3000+ calories a day of fruit and loose dangerous amounts of weight. It's not healthy to consume such low fat and protein but it goes to show you can't gain weight on fruit juice.
Conjecture: it's sugar and polyunsaturated fats at the same time that cause issues.
Conjecture: it's sugar and polyunsaturated fats at the same time that cause issues.