Biscuits and margarine are certainly not healthy. On one hand you have a high glycemic, gluten-laden processed food that turns into sugar as soon as you eat it. Then you have a highly inflammatory industrial vegetable/seed oil with a very poor fat profile.
Better options are to shop at farmers markets, grow your own garden, get bulk stuff from Costco, buy cheaper cuts of meat and braise them, ferment your own veges, and make bone broth.
Good health rarely comes from a package in a supermarket. The only packaged items I buy are ghee, coconut oil, butter, and canned wild sardines.