Day 14 birthday is over

The cake is gone! I made sure if that :-I ate so much rubbish. I'm tempted to do a fast day tomorrow like what my mum does on the 5:2 diet. You need to have 500 calories only. I could have a piece of fruit for breakfast (50)  baked potato and tuna for dinner (300) could go to asda and get a tuna snack pack for lunch. I'm sure it's only like 150? Or maybe it's 200? Either or I'll have around 500 cals. Might go down to tesco just now and get the stuff.