The question pertains to a guideline suggested by the World Health Organization (WHO) regarding salt intake to maintain health. Understanding the question's context is essential here, as it deals with health-related guidelines to prevent common issues like hypertension, heart disease, and stroke.

Let's analyze the options provided:

• 10 g per week
• 10 g per day
• 5 g per day
• 5 g per week

According to the World Health Organization's recommendations on salt intake, keeping the consumption of salt to less than 5 grams per day is suggested. This recommendation aims to prevent hypertension (high blood pressure) and reduce the risk of heart disease and stroke for adults. This guideline is based on extensive research indicating that excessive salt intake increases blood pressure and is a significant risk factor for cardiovascular diseases.

Correct Answer: 5 g per day

Let's justify why the other options are incorrect:

• 10 g per week: This would underestimate daily recommended limits as it averages to \(10 \, g \div 7 \approx 1.43 \, g\) per day, which is much lower than effective or recommended daily levels to prevent deficiencies while achieving health targets.
• 10 g per day: This is twice the recommended amount by the WHO, increasing the risk of cardiovascular diseases.
• 5 g per week: This option is even lower than the daily amount suggested, which may lead to underconsumption potentially affecting the body's sodium balance negatively.

By selecting 5 g per day, you are following international health guidelines intended to optimize health outcomes concerning heart-related diseases. Proper adherence to these guidelines can greatly reduce the burden of non-communicable diseases globally.