Speaking about protein, I have a friend who is seeing a nutritionist (not dating I mean, but to see what her nutritional deficiences are). She's told her to make one simple change: instead of reaching for carbs when she feels she needs a snack, reach for protein. She says Americans eat way more protein than they need to, but that's because they eat such huge portions. But a handful-size of protein 3x a day raises your seratonin in your brain (she says) and that is one key to not eat emotionally... you will feel fuller, more energetic, and less prone to stuff yourself with food, because your seratonin will be higher and you won't need to. So eating your tuna in the evening is likely a great idea! I reach for carbs, always, but will try nuts or tuna... I happen to like canned tuna, raw tuna and even cooked in the pan tuna!