Apparatus and method for estimating antioxidant component

A method of estimating an antioxidant component, the method comprising:

• estimating first antioxidant concentrations at a first body part;
• extracting, as training data, data pairs of the first antioxidant concentrations estimated at the first body part and second antioxidant concentrations estimated at a second body part from the storage based on learning conditions;
• and
• generating a transformation model configured to transform the second antioxidant concentrations into a reference index based on the training data.

An apparatus configured to estimate an antioxidant component, the apparatus comprising:

• a sensor configured to measure an optical signal from a body part of a user at which an antioxidant concentration is to be estimated;
• a processor, based on the optical signal being measured at the body part, configured to estimate the antioxidant concentration based on the measured optical signal, and to transform the estimated antioxidant concentration into a reference index based on a transformation model;
• and
• an output interface configured to output the transformed reference index,
• wherein the transformation model is a model that is trained to transform the antioxidant concentration, measured at the body part, into the reference index based on training data comprising one or more data pairs of an antioxidant concentration estimated at a reference part and the antioxidant concentration estimated at the body part.