Medlin explains that people who cut out all meat sources may initially feel great due to the influx of vitamins, but if they aren’t substituting with the correct alternatives, may end up feeling depleted from the lack of iron and B vitamins within a few weeks.

How fast does food work?

Stimulants can have an instant impact on the body – just think about how fast coffee hits you. But it turns out that food has the same fast-working effect. While this is often thought to be down to the boost in energy thanks to feeding your body with calories, there are also certain nutrients that can quickly impact how the body works.

For example, 200g of blueberries have been shown to improve brain concentration within 90 minutes. According to a 2011 study, it’s because blueberries almost immediately increase nitric oxide production and improve the flexibility of the blood vessels, allowing for an increase in blood flow to the brain.

Healthy diets: how long does it take for nutritional changes to work?