Issues with eating only nuts?

My diet is currently completely comprised by nuts aside from one meal each day. I probably ingest between 600 and 800 calories of nuts per day (usually almonds and/or pistachios) and have one meal around dinner time of about 600 calories. I know nuts are healthy, but with over half my diet being made up of nuts, im kind of worried about the fat content. while nuts are a good source of protein and fiber, theyre also extremely high in fat. i feel like i eat more fat than carbs or proteins. are there any consequences for this, or should I be okay? I havent been feeling any differently since I started eating this way (about a week ago), but I dont want to hurt myself. Any insight would be good. thanks :D