Lara, welcome to PaleoHacks. There's one thing I should let you know about how things work around here: we poo-poo on conventional wisdom. So you know those thoughts you're having about how eating late at night will automatically lead to fat storage? It's not true. Your body has no idea what time it is. It'll digest food normally at say, midnight, the same way it does at 8 a.m., noon, and 6 p.m. The same principles apply here: don't go overboard in eating and get some physical activity in throughout the day. If you're really truly hungry, then eat. I suggest keeping track of your calories.