Is £10.00 (around 419.34 THB) enough for breakfast lunch and dinner per day ?

So £10 works out to about 419.34 THB would this be enough for a light breakfast/ lunch and then a carb heavy meal for dinner in Bangkok?

We have never been to Thailand before and want to know how much to average spend for the day. We will be there 4 weeks in total so some days we will spend more/ less