Much more human effort went into making food back then. Our food is much cheaper than in the past. (Assuming you live in the US and are middle-class.) You can

Much more human effort went into making food back then. Our food is much cheaper than in the past. (Assuming you live in the US and are middle-class.) You can eat heathy if you want to. It's your choice what you eat. You can choose to only buy unprocessed food and make everything from scratch. You can bring your own meals with you when you travel away from your home. The fact that we have fresh vegetables imported from thousands of miles away, and plenty of frozen (but otherwise minimally-processed) food means you can have a better diet than back then. It's all about your choices.