You should focus on the food pyramid, the FDA has a few charts out there, lots of grains and cereals, fruits and vegetables, less dairy.
A few guppies is probably to small a portion. Fish should still be eaten a few times a week, but I would go with renewable fish like tilapia or farm raised salmon, and trout.

A few guppies is probably to small a portion. Fish should still be eaten a few times a week, but I would go with renewable fish like tilapia or farm raised salmon, and trout.