Is eating 100g parsnip, carrots, sweetcorn, asparagus, broccoli, banana, multi-vitamin and fish oil supplement a day enough to live a healthy life?

Nutrition: In order to have a healthy diet, yours is lacking protein and variety for that matter. Make sure not to forget to exercise in order "to live a healthy life".

Many components to: health. Eat healthfully w at least 5 servings of vegetables & 4 of fruit /day (organic is best). Increase nutritional fiber. Avoid refined sugar & junk carbohydrates. Avoid sweetened juices, soda & caffeinated beverages. Watch portion sizes. No tobacco, illicit drugs & low to no alcohol use. Aim for 7.5 to 8 hrs sleep /night. Hydrate w at least 64 oz of water / day. Maintain good hygiene. Daily

No: This diet is severely lacking in protein. It's similar to the diet that caused endemic pellagra, mental illness and death here in Mississippi. The only source of iron and B12 is the multi-vitamin, and you're likely to run low on calcium and some others. Trying this would be psychotic. Further, a "healthy life" includes exercise, love, pursuing meaningful goals, and much more.