A computer implemented method for controlling the intake of alimentation, such as medication or nutrition, in accordance with a time-based target comprises receiving data relating to the aliment being consumed, maintaining a balance of the alimentary constituent and generating a temporal estimate for the constituent. For example, the data relating to the amount of paracetomol consumed will be received, the total balance of paracetomol generated and the time that dose of paracetomol will last is calculated. The time take for groups of nutrients to be used by the body can also be calculated. A plurality of predictive temporal estimates are formed from the nutritional and pharmaceutical balances, enabling the user to make immediate and informed choices in real-time, to correct or fine-tune the alimentation in order to achieve or maintain dietary, medicinal and developmental goals. The system may be programmed to take account of the interaction between different foods and drugs and the lifestyle and genetics of the user. A mechanically-implemented system for controlling the intake of alimentation is also disclosed. The system may comprise rulers or gauges, such as slide rule, to assist with the calculation of temporal profiles.
