I ruined my diet? How much do you think I will put on? Help? 10 points!?

You said you just started yesterday- was that dinner "normal" for you before you decided to eat healthier? As in, does that sound like a normal day to you? If so, you probably wouldn't put on much weight. If that's a ton even for how you used to eat, you could be up a pound or two or three, which sucks, but it's a learning experience! If you're used to eating a large amount, going straight to a low calorie diet might be really hard for you- physiologically. You might want to eat more often and just more in general to avoid those huge binges. Don't keep those really fatty foods around you; ask the people who live with to help you avoid temptation, or if you're alone or the one who controls what is purchased, then rid your house of at least half of the junk you have. Keeping some treat is okay- treating yourself is good on occasion! But, don't buy family size pizzas if you're the only one, and don't buy three family size pizzas if it's just you and two roommates or you, your spouse, and a couple kids- one family pizza is enough to suffice.