Hi fiftw!
I had lower back problems too, this website was really helpful: Dr Bookspan's Sports Medicine - Fix Pain, Healthier Life - check free articles! Check position behind computer etc, get a laptop stand if you can? (or make DIY?) Connective Tissue Disorder Site says muscle imbalance/tension can be a cause too - I got books on trigger point therapy too, nutrition, posture &trigger points can be connected, didn't do much of it then though. There's a book about back-stress connection, helpful to read too.. &free spa treatment
(paid by healthcare, can u get a prescription by a doctor there too?)
For me meat was okay maybe 2-3x a week max, more brought pain, &veggies with it for antioxidants (salad and/or cooked, or both).. Fruit is best eaten separately (too much citrus, peach or vitamin C can cause back pain/rheumatism too) Maybe you could try some different recipes or different veggies or fruits?