In a world flooded with advertisements that promise instant happiness and create artificial needs, an essential question arises for every Christian: can deceptive advertising and the deliberate use of neuromarketing techniques to induce compulsive purchases be considered a sin against truth and charity?

The Catholic Church’s response is clear, profound, and at the same time, full of hope. Far from being a mere condemnation, the Church offers us a luminous guide for living the economy and consuming as true children of God.

The Catechism of the Catholic Church teaches that the eighth commandment—”You shall not bear false witness against your neighbor”—is not limited to words spoken in court. It prohibits all falsehoods that damage a just relationship with one’s neighbor (CCC 2464). Deceptive advertising, deliberate exaggerations, the concealment of serious defects, or the artificial creation of anxiety to sell a product are modern forms of lying. By presenting as “necessary” or “saving” something that is actually superfluous or even harmful, one directly attacks the truth and exploits the person.

Saint John Paul II, in his encyclical Centesimus Annus  (n. 36), already warned in 1991 that consumerism is a form of alienation when “having prevails over being” and when man is manipulated by advertising to desire things he does not need and which he often cannot afford.

Benedict XVI delved even deeper into this in Caritas in Veritate  (2009). With a positive and constructive perspective, he taught that all economic activity must be ordered toward the common good and permeated by charity in truth. When advertising uses neuromarketing techniques—which study brain responses to activate emotional impulses and bypass reason—to generate compulsive purchases, a clear violation of this charity occurs: the consumer ceases to be treated as a brother or sister and becomes a mere object of profit.

Pope Francis, in Laudato Si’ (nos. 203-204) and Fratelli Tutti, has been particularly forceful and approachable: he denounces the “technocratic paradigm” that considers human beings as mere cogs in the market and advertising as one of its main instruments of domination. But, true to form, he doesn’t stop at criticism: he invites us to an ecological and human conversion that includes sober, joyful, and responsible consumption. “Less is more,” he repeats, because true happiness lies not in accumulating, but in sharing and relating authentically.

The good news is that the Church does not reject advertising or marketing per se. The Pontifical Council for Social Communications, in its document Ethics in Advertising  (1997), explicitly states that advertising can be a positive service when:

• Report the truth
• Respect the dignity of the person
• Promotes the common good
• It does not exploit the fears, insecurities, or lowest instincts of human beings.

In short: yes, deceptive advertising and the deliberate manipulation of consumers through neuromarketing or big data constitute a serious offense against truth and charity. They are contemporary forms of lying and of using others as a means rather than an end.

But the Catholic faith never leaves us without hope or without a path. Today, we can begin to live differently:

• Educating ourselves to recognize manipulation techniques
• Practicing the happy sobriety proposed by Pope Francis
• Supporting ethical and transparent businesses
• Praying for advertisers and businesspeople, that they may discover that true success lies in serving, not in deceiving.

Because when we choose the truth in something as every day as a purchase, we are bearing witness that Christ reigns also in the supermarket, on the mobile phone screen and in the online shopping cart.

And there, in those small daily decisions, the Kingdom of God is built.