This leads to to talking about the most common thing I hear new vegans struggle from, and in particular athletic ones. They are hungry, they have low energy and feel the urge to get "real food" (meaning heavy fat and animal protein laden foods). To me this seems like a great problem to have but it is likely counter-intuitive to many. You have to eat more. While the foods I eat tend to be very high in nutrient density (in nutrients per calorie) compared to say steak, eggs and milk, they are low in actual calories. If you're an active person you really need to eat larger meals. This to me sounds great (I do after all love food), but for someone new to plant based eating it may make them nervous. You'll just have to trust me that you can't overeat spinach, greens and veggies. You just can't. Filling your stomach with a huge salad (minus commercial salad dressings and oil) is not going to make you pack on weight. It will however fill you with the nutrition you need to recover quickly from a workout and to live a vibrant healthy life.
My recommendation is that you always try and include protein and fat dense ingredients in your salad. You don't have to overdo it. A handful of nuts, seeds, cooked beans or half a sliced avocado will do the trick. This will leave you full, satisfied and over time your taste buds will adjust to enjoy the plain veggies without commercial dressings. I like to add fruit to my salads as well, whether dried or fresh. Still hungry after the giant salad? Eat more greens. But give it a few minutes, it may take time for your stomach to give you the thumbs up that it's all full and good. Remember that huge bowl of salad will physically fill your stomach with nutrient rich food whereas something like a hamburger and fries would fill only a portion of your stomach with a fraction of the nutrients and several times more calories and fat. When eating nutrient dense foods, and plenty of them you really can't lose the nutrition game. And an hour after your meal you'll feel light, refreshed and ready to tackle anything rather than suffering from lethargy and the meat sweats.