Poor old vitamin C, it must be a totally schizophrenic soul because one week it’s the villain as it reportedly can make chemotherapy less effective – though not everyone agrees with that – and this week it’s the hero if you are trying to lose weight. A new study from Arizona State University has found that if you have low vitamin C levels it means your body burns fat more slowly and that holds up weight loss. You can take a supplement, or stock up on Vitamin C-rich foods like oranges, strawberries,kiwis and tomatoes.