The goal of this clinical trial is to compare a dietary intervention with a regular diet in patients with early breast cancer undergoing anthracycline based chemotherapy. The main question it aims to answer is: What are the effects of a short-term diet with 30% caloric and 70% protein restriction (PCR) on cardiotoxicity induced by anthracycline treatment in women with newly diagnosed invasive breast cancer. Researchers will compare the control group with dietary intervention group to see if cardiotoxicity -measured by concentrations of high-sensitivity troponin T (hsTnT) levels- will be different between these two groups.
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High-sensitivity troponin T (hsTnT)
Timeframe: Bloodsamples will be taken before and 1 hour after each anthracycline based chemotherapy cycle. The cycles are given once every 2 weeks, for 4 cycles in total.